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Finding the Fourth Proportional to 711.18, 1,065.76 and 345.57

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Solution

The fourth proportional to 711.18, 1,065.76 and 345.57 is: 517.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.18 : 1,065.76 = 345.57 : x
  2. Step 2: Convert to fraction form
    711.18/1,065.76 = 345.57/x
  3. Step 3: Cross multiply
    711.18x = 1,065.76 × 345.57
  4. Step 4: Simplify right side
    711.18x = 368,289.82
  5. Step 5: Solve for x
    x = 368,289.82/711.18
  6. Step 6: Final answer
    x = 517.86

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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.