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Finding the Fourth Proportional to 319.40, 478.62 and 156.88

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Solution

The fourth proportional to 319.40, 478.62 and 156.88 is: 235.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.40 : 478.62 = 156.88 : x
  2. Step 2: Convert to fraction form
    319.40/478.62 = 156.88/x
  3. Step 3: Cross multiply
    319.40x = 478.62 × 156.88
  4. Step 4: Simplify right side
    319.40x = 75,085.91
  5. Step 5: Solve for x
    x = 75,085.91/319.40
  6. Step 6: Final answer
    x = 235.08

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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.