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Finding the Fourth Proportional to 620.30, 925.90 and 547.40

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Solution

The fourth proportional to 620.30, 925.90 and 547.40 is: 817.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.30 : 925.90 = 547.40 : x
  2. Step 2: Convert to fraction form
    620.30/925.90 = 547.40/x
  3. Step 3: Cross multiply
    620.30x = 925.90 × 547.40
  4. Step 4: Simplify right side
    620.30x = 506,837.66
  5. Step 5: Solve for x
    x = 506,837.66/620.30
  6. Step 6: Final answer
    x = 817.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.