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Finding the Fourth Proportional to 1,240.77, 1,861.05 and 753.69

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Solution

The fourth proportional to 1,240.77, 1,861.05 and 753.69 is: 1,130.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.77 : 1,861.05 = 753.69 : x
  2. Step 2: Convert to fraction form
    1,240.77/1,861.05 = 753.69/x
  3. Step 3: Cross multiply
    1,240.77x = 1,861.05 × 753.69
  4. Step 4: Simplify right side
    1,240.77x = 1,402,654.77
  5. Step 5: Solve for x
    x = 1,402,654.77/1,240.77
  6. Step 6: Final answer
    x = 1,130.47

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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.