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Finding the Fourth Proportional to 768.72, 1,060.42 and 664.24

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Solution

The fourth proportional to 768.72, 1,060.42 and 664.24 is: 916.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.72 : 1,060.42 = 664.24 : x
  2. Step 2: Convert to fraction form
    768.72/1,060.42 = 664.24/x
  3. Step 3: Cross multiply
    768.72x = 1,060.42 × 664.24
  4. Step 4: Simplify right side
    768.72x = 704,373.38
  5. Step 5: Solve for x
    x = 704,373.38/768.72
  6. Step 6: Final answer
    x = 916.29

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1.5x scale

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.