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Finding the Fourth Proportional to 765.86, 1,148.78 and 400.75

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Solution

The fourth proportional to 765.86, 1,148.78 and 400.75 is: 601.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.86 : 1,148.78 = 400.75 : x
  2. Step 2: Convert to fraction form
    765.86/1,148.78 = 400.75/x
  3. Step 3: Cross multiply
    765.86x = 1,148.78 × 400.75
  4. Step 4: Simplify right side
    765.86x = 460,371.71
  5. Step 5: Solve for x
    x = 460,371.71/765.86
  6. Step 6: Final answer
    x = 601.12

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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.