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Finding the Fourth Proportional to 617,631.70, 926,447.55 and 428,674.90

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Solution

The fourth proportional to 617,631.70, 926,447.55 and 428,674.90 is: 643,012.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,631.70 : 926,447.55 = 428,674.90 : x
  2. Step 2: Convert to fraction form
    617,631.70/926,447.55 = 428,674.90/x
  3. Step 3: Cross multiply
    617,631.70x = 926,447.55 × 428,674.90
  4. Step 4: Simplify right side
    617,631.70x = 397,144,810,851.50
  5. Step 5: Solve for x
    x = 397,144,810,851.50/617,631.70
  6. Step 6: Final answer
    x = 643,012.35

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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.