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Finding the Fourth Proportional to 930.52, 1,392.76 and 621.08

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Solution

The fourth proportional to 930.52, 1,392.76 and 621.08 is: 929.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.52 : 1,392.76 = 621.08 : x
  2. Step 2: Convert to fraction form
    930.52/1,392.76 = 621.08/x
  3. Step 3: Cross multiply
    930.52x = 1,392.76 × 621.08
  4. Step 4: Simplify right side
    930.52x = 865,015.38
  5. Step 5: Solve for x
    x = 865,015.38/930.52
  6. Step 6: Final answer
    x = 929.60

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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.