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Finding the Fourth Proportional to 1,275.18, 1,910.44 and 753.72

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Solution

The fourth proportional to 1,275.18, 1,910.44 and 753.72 is: 1,129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.18 : 1,910.44 = 753.72 : x
  2. Step 2: Convert to fraction form
    1,275.18/1,910.44 = 753.72/x
  3. Step 3: Cross multiply
    1,275.18x = 1,910.44 × 753.72
  4. Step 4: Simplify right side
    1,275.18x = 1,439,929.06
  5. Step 5: Solve for x
    x = 1,439,929.06/1,275.18
  6. Step 6: Final answer
    x = 1,129.20

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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.