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Finding the Fourth Proportional to 781, 1,170.47 and 318.23

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Solution

The fourth proportional to 781, 1,170.47 and 318.23 is: 476.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    781 : 1,170.47 = 318.23 : x
  2. Step 2: Convert to fraction form
    781/1,170.47 = 318.23/x
  3. Step 3: Cross multiply
    781x = 1,170.47 × 318.23
  4. Step 4: Simplify right side
    781x = 372,478.67
  5. Step 5: Solve for x
    x = 372,478.67/781
  6. Step 6: Final answer
    x = 476.93

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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.