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Finding the Fourth Proportional to 1,140.68, 1,572.29 and 891.56

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Solution

The fourth proportional to 1,140.68, 1,572.29 and 891.56 is: 1,228.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.68 : 1,572.29 = 891.56 : x
  2. Step 2: Convert to fraction form
    1,140.68/1,572.29 = 891.56/x
  3. Step 3: Cross multiply
    1,140.68x = 1,572.29 × 891.56
  4. Step 4: Simplify right side
    1,140.68x = 1,401,786.41
  5. Step 5: Solve for x
    x = 1,401,786.41/1,140.68
  6. Step 6: Final answer
    x = 1,228.90

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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.