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Finding the Fourth Proportional to 538.48, 807.70 and 143.15

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Solution

The fourth proportional to 538.48, 807.70 and 143.15 is: 214.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.48 : 807.70 = 143.15 : x
  2. Step 2: Convert to fraction form
    538.48/807.70 = 143.15/x
  3. Step 3: Cross multiply
    538.48x = 807.70 × 143.15
  4. Step 4: Simplify right side
    538.48x = 115,623.65
  5. Step 5: Solve for x
    x = 115,623.65/538.48
  6. Step 6: Final answer
    x = 214.72

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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.