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Finding the Fourth Proportional to 625.98, 864.28 and 390.02

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Solution

The fourth proportional to 625.98, 864.28 and 390.02 is: 538.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.98 : 864.28 = 390.02 : x
  2. Step 2: Convert to fraction form
    625.98/864.28 = 390.02/x
  3. Step 3: Cross multiply
    625.98x = 864.28 × 390.02
  4. Step 4: Simplify right side
    625.98x = 337,087.67
  5. Step 5: Solve for x
    x = 337,087.67/625.98
  6. Step 6: Final answer
    x = 538.50

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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.