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Finding the Fourth Proportional to 319.10, 478.63 and 87.98

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Solution

The fourth proportional to 319.10, 478.63 and 87.98 is: 131.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.10 : 478.63 = 87.98 : x
  2. Step 2: Convert to fraction form
    319.10/478.63 = 87.98/x
  3. Step 3: Cross multiply
    319.10x = 478.63 × 87.98
  4. Step 4: Simplify right side
    319.10x = 42,107.58
  5. Step 5: Solve for x
    x = 42,107.58/319.10
  6. Step 6: Final answer
    x = 131.96

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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.