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Finding the Fourth Proportional to 865.93, 1,298.90 and 622.93

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Solution

The fourth proportional to 865.93, 1,298.90 and 622.93 is: 934.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.93 : 1,298.90 = 622.93 : x
  2. Step 2: Convert to fraction form
    865.93/1,298.90 = 622.93/x
  3. Step 3: Cross multiply
    865.93x = 1,298.90 × 622.93
  4. Step 4: Simplify right side
    865.93x = 809,123.78
  5. Step 5: Solve for x
    x = 809,123.78/865.93
  6. Step 6: Final answer
    x = 934.40

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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.