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Finding the Fourth Proportional to 916.32, 1,372.80 and 772.80

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Solution

The fourth proportional to 916.32, 1,372.80 and 772.80 is: 1,157.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.32 : 1,372.80 = 772.80 : x
  2. Step 2: Convert to fraction form
    916.32/1,372.80 = 772.80/x
  3. Step 3: Cross multiply
    916.32x = 1,372.80 × 772.80
  4. Step 4: Simplify right side
    916.32x = 1,060,899.84
  5. Step 5: Solve for x
    x = 1,060,899.84/916.32
  6. Step 6: Final answer
    x = 1,157.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.