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Finding the Fourth Proportional to 315.30, 473.00 and 139.80

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Solution

The fourth proportional to 315.30, 473.00 and 139.80 is: 209.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.30 : 473.00 = 139.80 : x
  2. Step 2: Convert to fraction form
    315.30/473.00 = 139.80/x
  3. Step 3: Cross multiply
    315.30x = 473.00 × 139.80
  4. Step 4: Simplify right side
    315.30x = 66,124.70
  5. Step 5: Solve for x
    x = 66,124.70/315.30
  6. Step 6: Final answer
    x = 209.72

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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.