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Finding the Fourth Proportional to 739.92, 1,113.96 and 649.20

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Solution

The fourth proportional to 739.92, 1,113.96 and 649.20 is: 977.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.92 : 1,113.96 = 649.20 : x
  2. Step 2: Convert to fraction form
    739.92/1,113.96 = 649.20/x
  3. Step 3: Cross multiply
    739.92x = 1,113.96 × 649.20
  4. Step 4: Simplify right side
    739.92x = 723,182.83
  5. Step 5: Solve for x
    x = 723,182.83/739.92
  6. Step 6: Final answer
    x = 977.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.