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Finding the Fourth Proportional to 620.55, 929.55 and 512.40

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Solution

The fourth proportional to 620.55, 929.55 and 512.40 is: 767.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.55 : 929.55 = 512.40 : x
  2. Step 2: Convert to fraction form
    620.55/929.55 = 512.40/x
  3. Step 3: Cross multiply
    620.55x = 929.55 × 512.40
  4. Step 4: Simplify right side
    620.55x = 476,301.42
  5. Step 5: Solve for x
    x = 476,301.42/620.55
  6. Step 6: Final answer
    x = 767.55

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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.