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Finding the Fourth Proportional to 1,254.16, 1,730.40 and 861.28

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Solution

The fourth proportional to 1,254.16, 1,730.40 and 861.28 is: 1,188.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.16 : 1,730.40 = 861.28 : x
  2. Step 2: Convert to fraction form
    1,254.16/1,730.40 = 861.28/x
  3. Step 3: Cross multiply
    1,254.16x = 1,730.40 × 861.28
  4. Step 4: Simplify right side
    1,254.16x = 1,490,358.91
  5. Step 5: Solve for x
    x = 1,490,358.91/1,254.16
  6. Step 6: Final answer
    x = 1,188.33

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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.