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Finding the Fourth Proportional to 765.45, 1,148.58 and 400.23

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Solution

The fourth proportional to 765.45, 1,148.58 and 400.23 is: 600.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.45 : 1,148.58 = 400.23 : x
  2. Step 2: Convert to fraction form
    765.45/1,148.58 = 400.23/x
  3. Step 3: Cross multiply
    765.45x = 1,148.58 × 400.23
  4. Step 4: Simplify right side
    765.45x = 459,696.17
  5. Step 5: Solve for x
    x = 459,696.17/765.45
  6. Step 6: Final answer
    x = 600.56

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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.