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Finding the Fourth Proportional to 1,239.63, 1,711 and 715.96

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Solution

The fourth proportional to 1,239.63, 1,711 and 715.96 is: 988.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.63 : 1,711 = 715.96 : x
  2. Step 2: Convert to fraction form
    1,239.63/1,711 = 715.96/x
  3. Step 3: Cross multiply
    1,239.63x = 1,711 × 715.96
  4. Step 4: Simplify right side
    1,239.63x = 1,225,007.56
  5. Step 5: Solve for x
    x = 1,225,007.56/1,239.63
  6. Step 6: Final answer
    x = 988.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.