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Finding the Fourth Proportional to 1,239.17, 1,710.05 and 741.78

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Solution

The fourth proportional to 1,239.17, 1,710.05 and 741.78 is: 1,023.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.17 : 1,710.05 = 741.78 : x
  2. Step 2: Convert to fraction form
    1,239.17/1,710.05 = 741.78/x
  3. Step 3: Cross multiply
    1,239.17x = 1,710.05 × 741.78
  4. Step 4: Simplify right side
    1,239.17x = 1,268,477.18
  5. Step 5: Solve for x
    x = 1,268,477.18/1,239.17
  6. Step 6: Final answer
    x = 1,023.65

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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.