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Finding the Fourth Proportional to 916.48, 1,264.88 and 721.46

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Solution

The fourth proportional to 916.48, 1,264.88 and 721.46 is: 995.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.48 : 1,264.88 = 721.46 : x
  2. Step 2: Convert to fraction form
    916.48/1,264.88 = 721.46/x
  3. Step 3: Cross multiply
    916.48x = 1,264.88 × 721.46
  4. Step 4: Simplify right side
    916.48x = 912,560.32
  5. Step 5: Solve for x
    x = 912,560.32/916.48
  6. Step 6: Final answer
    x = 995.72

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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.