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Finding the Fourth Proportional to 713.81, 1,070.77 and 238.90

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Solution

The fourth proportional to 713.81, 1,070.77 and 238.90 is: 358.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.81 : 1,070.77 = 238.90 : x
  2. Step 2: Convert to fraction form
    713.81/1,070.77 = 238.90/x
  3. Step 3: Cross multiply
    713.81x = 1,070.77 × 238.90
  4. Step 4: Simplify right side
    713.81x = 255,806.13
  5. Step 5: Solve for x
    x = 255,806.13/713.81
  6. Step 6: Final answer
    x = 358.37

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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.