Home / 715,521.28-987,443.04-393,242.80

Finding the Fourth Proportional to 715,521.28, 987,443.04 and 393,242.80

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Solution

The fourth proportional to 715,521.28, 987,443.04 and 393,242.80 is: 542,688.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,521.28 : 987,443.04 = 393,242.80 : x
  2. Step 2: Convert to fraction form
    715,521.28/987,443.04 = 393,242.80/x
  3. Step 3: Cross multiply
    715,521.28x = 987,443.04 × 393,242.80
  4. Step 4: Simplify right side
    715,521.28x = 388,304,865,890.11
  5. Step 5: Solve for x
    x = 388,304,865,890.11/715,521.28
  6. Step 6: Final answer
    x = 542,688.07

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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.