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Finding the Fourth Proportional to 1,123.44, 1,688.40 and 741.12

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Solution

The fourth proportional to 1,123.44, 1,688.40 and 741.12 is: 1,113.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.44 : 1,688.40 = 741.12 : x
  2. Step 2: Convert to fraction form
    1,123.44/1,688.40 = 741.12/x
  3. Step 3: Cross multiply
    1,123.44x = 1,688.40 × 741.12
  4. Step 4: Simplify right side
    1,123.44x = 1,251,307.01
  5. Step 5: Solve for x
    x = 1,251,307.01/1,123.44
  6. Step 6: Final answer
    x = 1,113.82

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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.