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Finding the Fourth Proportional to 1,240.66, 1,711.98 and 716.68

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Solution

The fourth proportional to 1,240.66, 1,711.98 and 716.68 is: 988.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.66 : 1,711.98 = 716.68 : x
  2. Step 2: Convert to fraction form
    1,240.66/1,711.98 = 716.68/x
  3. Step 3: Cross multiply
    1,240.66x = 1,711.98 × 716.68
  4. Step 4: Simplify right side
    1,240.66x = 1,226,941.83
  5. Step 5: Solve for x
    x = 1,226,941.83/1,240.66
  6. Step 6: Final answer
    x = 988.94

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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.