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Finding the Fourth Proportional to 1,358.57, 1,875.62 and 861.63

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Solution

The fourth proportional to 1,358.57, 1,875.62 and 861.63 is: 1,189.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358.57 : 1,875.62 = 861.63 : x
  2. Step 2: Convert to fraction form
    1,358.57/1,875.62 = 861.63/x
  3. Step 3: Cross multiply
    1,358.57x = 1,875.62 × 861.63
  4. Step 4: Simplify right side
    1,358.57x = 1,616,086.15
  5. Step 5: Solve for x
    x = 1,616,086.15/1,358.57
  6. Step 6: Final answer
    x = 1,189.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.