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Finding the Fourth Proportional to 1,240.38, 1,711.80 and 716.45

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Solution

The fourth proportional to 1,240.38, 1,711.80 and 716.45 is: 988.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.38 : 1,711.80 = 716.45 : x
  2. Step 2: Convert to fraction form
    1,240.38/1,711.80 = 716.45/x
  3. Step 3: Cross multiply
    1,240.38x = 1,711.80 × 716.45
  4. Step 4: Simplify right side
    1,240.38x = 1,226,410.55
  5. Step 5: Solve for x
    x = 1,226,410.55/1,240.38
  6. Step 6: Final answer
    x = 988.74

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Half scale
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Double scale
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1.5x scale

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.