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Finding the Fourth Proportional to 1,240.05, 1,710.93 and 742.89

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Solution

The fourth proportional to 1,240.05, 1,710.93 and 742.89 is: 1,024.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.05 : 1,710.93 = 742.89 : x
  2. Step 2: Convert to fraction form
    1,240.05/1,710.93 = 742.89/x
  3. Step 3: Cross multiply
    1,240.05x = 1,710.93 × 742.89
  4. Step 4: Simplify right side
    1,240.05x = 1,271,032.79
  5. Step 5: Solve for x
    x = 1,271,032.79/1,240.05
  6. Step 6: Final answer
    x = 1,024.99

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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.