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Finding the Fourth Proportional to 1,387.80, 1,914.48 and 916.52

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Solution

The fourth proportional to 1,387.80, 1,914.48 and 916.52 is: 1,264.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.80 : 1,914.48 = 916.52 : x
  2. Step 2: Convert to fraction form
    1,387.80/1,914.48 = 916.52/x
  3. Step 3: Cross multiply
    1,387.80x = 1,914.48 × 916.52
  4. Step 4: Simplify right side
    1,387.80x = 1,754,659.21
  5. Step 5: Solve for x
    x = 1,754,659.21/1,387.80
  6. Step 6: Final answer
    x = 1,264.35

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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.