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Finding the Fourth Proportional to 753.15, 1,129.76 and 266.25

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Solution

The fourth proportional to 753.15, 1,129.76 and 266.25 is: 399.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.15 : 1,129.76 = 266.25 : x
  2. Step 2: Convert to fraction form
    753.15/1,129.76 = 266.25/x
  3. Step 3: Cross multiply
    753.15x = 1,129.76 × 266.25
  4. Step 4: Simplify right side
    753.15x = 300,798.60
  5. Step 5: Solve for x
    x = 300,798.60/753.15
  6. Step 6: Final answer
    x = 399.39

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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.