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Finding the Fourth Proportional to 916.72, 1,265.22 and 707.20

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Solution

The fourth proportional to 916.72, 1,265.22 and 707.20 is: 976.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.72 : 1,265.22 = 707.20 : x
  2. Step 2: Convert to fraction form
    916.72/1,265.22 = 707.20/x
  3. Step 3: Cross multiply
    916.72x = 1,265.22 × 707.20
  4. Step 4: Simplify right side
    916.72x = 894,763.58
  5. Step 5: Solve for x
    x = 894,763.58/916.72
  6. Step 6: Final answer
    x = 976.05

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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.