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Finding the Fourth Proportional to 878.90, 1,318.28 and 358.77

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Solution

The fourth proportional to 878.90, 1,318.28 and 358.77 is: 538.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.90 : 1,318.28 = 358.77 : x
  2. Step 2: Convert to fraction form
    878.90/1,318.28 = 358.77/x
  3. Step 3: Cross multiply
    878.90x = 1,318.28 × 358.77
  4. Step 4: Simplify right side
    878.90x = 472,960.21
  5. Step 5: Solve for x
    x = 472,960.21/878.90
  6. Step 6: Final answer
    x = 538.13

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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.