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Finding the Fourth Proportional to 1,140.71, 1,711.89 and 491.63

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Solution

The fourth proportional to 1,140.71, 1,711.89 and 491.63 is: 737.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.71 : 1,711.89 = 491.63 : x
  2. Step 2: Convert to fraction form
    1,140.71/1,711.89 = 491.63/x
  3. Step 3: Cross multiply
    1,140.71x = 1,711.89 × 491.63
  4. Step 4: Simplify right side
    1,140.71x = 841,616.48
  5. Step 5: Solve for x
    x = 841,616.48/1,140.71
  6. Step 6: Final answer
    x = 737.80

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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.