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Finding the Fourth Proportional to 713.50, 1,070.38 and 421.50

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Solution

The fourth proportional to 713.50, 1,070.38 and 421.50 is: 632.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.50 : 1,070.38 = 421.50 : x
  2. Step 2: Convert to fraction form
    713.50/1,070.38 = 421.50/x
  3. Step 3: Cross multiply
    713.50x = 1,070.38 × 421.50
  4. Step 4: Simplify right side
    713.50x = 451,165.17
  5. Step 5: Solve for x
    x = 451,165.17/713.50
  6. Step 6: Final answer
    x = 632.33

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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.