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Finding the Fourth Proportional to 625.40, 935.40 and 528.20

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Solution

The fourth proportional to 625.40, 935.40 and 528.20 is: 790.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.40 : 935.40 = 528.20 : x
  2. Step 2: Convert to fraction form
    625.40/935.40 = 528.20/x
  3. Step 3: Cross multiply
    625.40x = 935.40 × 528.20
  4. Step 4: Simplify right side
    625.40x = 494,078.28
  5. Step 5: Solve for x
    x = 494,078.28/625.40
  6. Step 6: Final answer
    x = 790.02

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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.