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Finding the Fourth Proportional to 711.24, 1,065.76 and 300.15

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Solution

The fourth proportional to 711.24, 1,065.76 and 300.15 is: 449.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.24 : 1,065.76 = 300.15 : x
  2. Step 2: Convert to fraction form
    711.24/1,065.76 = 300.15/x
  3. Step 3: Cross multiply
    711.24x = 1,065.76 × 300.15
  4. Step 4: Simplify right side
    711.24x = 319,887.86
  5. Step 5: Solve for x
    x = 319,887.86/711.24
  6. Step 6: Final answer
    x = 449.76

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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.