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Finding the Fourth Proportional to 1,129.56, 1,559.02 and 1,041.72

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Solution

The fourth proportional to 1,129.56, 1,559.02 and 1,041.72 is: 1,437.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.56 : 1,559.02 = 1,041.72 : x
  2. Step 2: Convert to fraction form
    1,129.56/1,559.02 = 1,041.72/x
  3. Step 3: Cross multiply
    1,129.56x = 1,559.02 × 1,041.72
  4. Step 4: Simplify right side
    1,129.56x = 1,624,062.31
  5. Step 5: Solve for x
    x = 1,624,062.31/1,129.56
  6. Step 6: Final answer
    x = 1,437.78

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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.