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Finding the Fourth Proportional to 753.76, 1,128.26 and 675.50

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Solution

The fourth proportional to 753.76, 1,128.26 and 675.50 is: 1,011.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.76 : 1,128.26 = 675.50 : x
  2. Step 2: Convert to fraction form
    753.76/1,128.26 = 675.50/x
  3. Step 3: Cross multiply
    753.76x = 1,128.26 × 675.50
  4. Step 4: Simplify right side
    753.76x = 762,139.63
  5. Step 5: Solve for x
    x = 762,139.63/753.76
  6. Step 6: Final answer
    x = 1,011.12

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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.