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Finding the Fourth Proportional to 713.51, 1,070.87 and 280.97

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Solution

The fourth proportional to 713.51, 1,070.87 and 280.97 is: 421.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.51 : 1,070.87 = 280.97 : x
  2. Step 2: Convert to fraction form
    713.51/1,070.87 = 280.97/x
  3. Step 3: Cross multiply
    713.51x = 1,070.87 × 280.97
  4. Step 4: Simplify right side
    713.51x = 300,881.18
  5. Step 5: Solve for x
    x = 300,881.18/713.51
  6. Step 6: Final answer
    x = 421.69

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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.