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Finding the Fourth Proportional to 616.40, 924.60 and 385.55

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Solution

The fourth proportional to 616.40, 924.60 and 385.55 is: 578.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.40 : 924.60 = 385.55 : x
  2. Step 2: Convert to fraction form
    616.40/924.60 = 385.55/x
  3. Step 3: Cross multiply
    616.40x = 924.60 × 385.55
  4. Step 4: Simplify right side
    616.40x = 356,479.53
  5. Step 5: Solve for x
    x = 356,479.53/616.40
  6. Step 6: Final answer
    x = 578.33

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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.