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Finding the Fourth Proportional to 316.70, 474.78 and 111.40

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Solution

The fourth proportional to 316.70, 474.78 and 111.40 is: 167.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.70 : 474.78 = 111.40 : x
  2. Step 2: Convert to fraction form
    316.70/474.78 = 111.40/x
  3. Step 3: Cross multiply
    316.70x = 474.78 × 111.40
  4. Step 4: Simplify right side
    316.70x = 52,888.89
  5. Step 5: Solve for x
    x = 52,888.89/316.70
  6. Step 6: Final answer
    x = 167.00

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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.