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Finding the Fourth Proportional to 921,605.40, 1,382,408.10 and 256,757.40

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Solution

The fourth proportional to 921,605.40, 1,382,408.10 and 256,757.40 is: 385,136.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    921,605.40 : 1,382,408.10 = 256,757.40 : x
  2. Step 2: Convert to fraction form
    921,605.40/1,382,408.10 = 256,757.40/x
  3. Step 3: Cross multiply
    921,605.40x = 1,382,408.10 × 256,757.40
  4. Step 4: Simplify right side
    921,605.40x = 354,943,509,494.94
  5. Step 5: Solve for x
    x = 354,943,509,494.94/921,605.40
  6. Step 6: Final answer
    x = 385,136.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.