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Finding the Fourth Proportional to 1,140.74, 1,711.86 and 708.20

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Solution

The fourth proportional to 1,140.74, 1,711.86 and 708.20 is: 1,062.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.74 : 1,711.86 = 708.20 : x
  2. Step 2: Convert to fraction form
    1,140.74/1,711.86 = 708.20/x
  3. Step 3: Cross multiply
    1,140.74x = 1,711.86 × 708.20
  4. Step 4: Simplify right side
    1,140.74x = 1,212,339.25
  5. Step 5: Solve for x
    x = 1,212,339.25/1,140.74
  6. Step 6: Final answer
    x = 1,062.77

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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.