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Finding the Fourth Proportional to 1,235.68, 1,705.20 and 711.52

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Solution

The fourth proportional to 1,235.68, 1,705.20 and 711.52 is: 981.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.68 : 1,705.20 = 711.52 : x
  2. Step 2: Convert to fraction form
    1,235.68/1,705.20 = 711.52/x
  3. Step 3: Cross multiply
    1,235.68x = 1,705.20 × 711.52
  4. Step 4: Simplify right side
    1,235.68x = 1,213,283.90
  5. Step 5: Solve for x
    x = 1,213,283.90/1,235.68
  6. Step 6: Final answer
    x = 981.88

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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.