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Finding the Fourth Proportional to 782.21, 1,173.88 and 392.10

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Solution

The fourth proportional to 782.21, 1,173.88 and 392.10 is: 588.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.21 : 1,173.88 = 392.10 : x
  2. Step 2: Convert to fraction form
    782.21/1,173.88 = 392.10/x
  3. Step 3: Cross multiply
    782.21x = 1,173.88 × 392.10
  4. Step 4: Simplify right side
    782.21x = 460,278.84
  5. Step 5: Solve for x
    x = 460,278.84/782.21
  6. Step 6: Final answer
    x = 588.44

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Double scale
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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.