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Finding the Fourth Proportional to 1,287.46, 1,931.10 and 739.18

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Solution

The fourth proportional to 1,287.46, 1,931.10 and 739.18 is: 1,108.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.46 : 1,931.10 = 739.18 : x
  2. Step 2: Convert to fraction form
    1,287.46/1,931.10 = 739.18/x
  3. Step 3: Cross multiply
    1,287.46x = 1,931.10 × 739.18
  4. Step 4: Simplify right side
    1,287.46x = 1,427,430.50
  5. Step 5: Solve for x
    x = 1,427,430.50/1,287.46
  6. Step 6: Final answer
    x = 1,108.72

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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.