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Finding the Fourth Proportional to 1,140.88, 1,711.63 and 491.47

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Solution

The fourth proportional to 1,140.88, 1,711.63 and 491.47 is: 737.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.88 : 1,711.63 = 491.47 : x
  2. Step 2: Convert to fraction form
    1,140.88/1,711.63 = 491.47/x
  3. Step 3: Cross multiply
    1,140.88x = 1,711.63 × 491.47
  4. Step 4: Simplify right side
    1,140.88x = 841,214.80
  5. Step 5: Solve for x
    x = 841,214.80/1,140.88
  6. Step 6: Final answer
    x = 737.34

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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.