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Finding the Fourth Proportional to 1,243.80, 1,865.58 and 756.72

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Solution

The fourth proportional to 1,243.80, 1,865.58 and 756.72 is: 1,135.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.80 : 1,865.58 = 756.72 : x
  2. Step 2: Convert to fraction form
    1,243.80/1,865.58 = 756.72/x
  3. Step 3: Cross multiply
    1,243.80x = 1,865.58 × 756.72
  4. Step 4: Simplify right side
    1,243.80x = 1,411,721.70
  5. Step 5: Solve for x
    x = 1,411,721.70/1,243.80
  6. Step 6: Final answer
    x = 1,135.01

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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.