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Finding the Fourth Proportional to 316.49, 474.29 and 143.10

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Solution

The fourth proportional to 316.49, 474.29 and 143.10 is: 214.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.49 : 474.29 = 143.10 : x
  2. Step 2: Convert to fraction form
    316.49/474.29 = 143.10/x
  3. Step 3: Cross multiply
    316.49x = 474.29 × 143.10
  4. Step 4: Simplify right side
    316.49x = 67,870.90
  5. Step 5: Solve for x
    x = 67,870.90/316.49
  6. Step 6: Final answer
    x = 214.45

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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.