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Finding the Fourth Proportional to 571,432.07, 787,987.79 and 399,287.30

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Solution

The fourth proportional to 571,432.07, 787,987.79 and 399,287.30 is: 550,605.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    571,432.07 : 787,987.79 = 399,287.30 : x
  2. Step 2: Convert to fraction form
    571,432.07/787,987.79 = 399,287.30/x
  3. Step 3: Cross multiply
    571,432.07x = 787,987.79 × 399,287.30
  4. Step 4: Simplify right side
    571,432.07x = 314,633,517,125.23
  5. Step 5: Solve for x
    x = 314,633,517,125.23/571,432.07
  6. Step 6: Final answer
    x = 550,605.29

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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.