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Finding the Fourth Proportional to 318.16, 477.31 and 98.77

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Solution

The fourth proportional to 318.16, 477.31 and 98.77 is: 148.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.16 : 477.31 = 98.77 : x
  2. Step 2: Convert to fraction form
    318.16/477.31 = 98.77/x
  3. Step 3: Cross multiply
    318.16x = 477.31 × 98.77
  4. Step 4: Simplify right side
    318.16x = 47,143.91
  5. Step 5: Solve for x
    x = 47,143.91/318.16
  6. Step 6: Final answer
    x = 148.18

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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.