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Finding the Fourth Proportional to 638,280.72, 881,668.80 and 476,855.28

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Solution

The fourth proportional to 638,280.72, 881,668.80 and 476,855.28 is: 658,688.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,280.72 : 881,668.80 = 476,855.28 : x
  2. Step 2: Convert to fraction form
    638,280.72/881,668.80 = 476,855.28/x
  3. Step 3: Cross multiply
    638,280.72x = 881,668.80 × 476,855.28
  4. Step 4: Simplify right side
    638,280.72x = 420,428,422,491.26
  5. Step 5: Solve for x
    x = 420,428,422,491.26/638,280.72
  6. Step 6: Final answer
    x = 658,688.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.