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Finding the Fourth Proportional to 642,732.70, 965,135.85 and 485,139.10

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Solution

The fourth proportional to 642,732.70, 965,135.85 and 485,139.10 is: 728,491.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,732.70 : 965,135.85 = 485,139.10 : x
  2. Step 2: Convert to fraction form
    642,732.70/965,135.85 = 485,139.10/x
  3. Step 3: Cross multiply
    642,732.70x = 965,135.85 × 485,139.10
  4. Step 4: Simplify right side
    642,732.70x = 468,225,137,646.74
  5. Step 5: Solve for x
    x = 468,225,137,646.74/642,732.70
  6. Step 6: Final answer
    x = 728,491.23

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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.