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Finding the Fourth Proportional to 646,711.20, 970,066.80 and 640,490.40

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Solution

The fourth proportional to 646,711.20, 970,066.80 and 640,490.40 is: 960,735.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,711.20 : 970,066.80 = 640,490.40 : x
  2. Step 2: Convert to fraction form
    646,711.20/970,066.80 = 640,490.40/x
  3. Step 3: Cross multiply
    646,711.20x = 970,066.80 × 640,490.40
  4. Step 4: Simplify right side
    646,711.20x = 621,318,472,758.72
  5. Step 5: Solve for x
    x = 621,318,472,758.72/646,711.20
  6. Step 6: Final answer
    x = 960,735.60

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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.