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Finding the Fourth Proportional to 315.80, 473.71 and 84.70

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Solution

The fourth proportional to 315.80, 473.71 and 84.70 is: 127.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.80 : 473.71 = 84.70 : x
  2. Step 2: Convert to fraction form
    315.80/473.71 = 84.70/x
  3. Step 3: Cross multiply
    315.80x = 473.71 × 84.70
  4. Step 4: Simplify right side
    315.80x = 40,123.24
  5. Step 5: Solve for x
    x = 40,123.24/315.80
  6. Step 6: Final answer
    x = 127.05

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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.