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Finding the Fourth Proportional to 642,718.70, 965,114.85 and 485,125.10

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Solution

The fourth proportional to 642,718.70, 965,114.85 and 485,125.10 is: 728,470.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,718.70 : 965,114.85 = 485,125.10 : x
  2. Step 2: Convert to fraction form
    642,718.70/965,114.85 = 485,125.10/x
  3. Step 3: Cross multiply
    642,718.70x = 965,114.85 × 485,125.10
  4. Step 4: Simplify right side
    642,718.70x = 468,201,438,117.74
  5. Step 5: Solve for x
    x = 468,201,438,117.74/642,718.70
  6. Step 6: Final answer
    x = 728,470.23

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Double scale
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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.