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Finding the Fourth Proportional to 1,135.71, 1,567.61 and 742.79

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Solution

The fourth proportional to 1,135.71, 1,567.61 and 742.79 is: 1,025.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.71 : 1,567.61 = 742.79 : x
  2. Step 2: Convert to fraction form
    1,135.71/1,567.61 = 742.79/x
  3. Step 3: Cross multiply
    1,135.71x = 1,567.61 × 742.79
  4. Step 4: Simplify right side
    1,135.71x = 1,164,405.03
  5. Step 5: Solve for x
    x = 1,164,405.03/1,135.71
  6. Step 6: Final answer
    x = 1,025.27

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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.