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Finding the Fourth Proportional to 865.64, 1,298.18 and 288.38

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Solution

The fourth proportional to 865.64, 1,298.18 and 288.38 is: 432.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.64 : 1,298.18 = 288.38 : x
  2. Step 2: Convert to fraction form
    865.64/1,298.18 = 288.38/x
  3. Step 3: Cross multiply
    865.64x = 1,298.18 × 288.38
  4. Step 4: Simplify right side
    865.64x = 374,363.38
  5. Step 5: Solve for x
    x = 374,363.38/865.64
  6. Step 6: Final answer
    x = 432.47

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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.