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Finding the Fourth Proportional to 318.76, 478.42 and 156.58

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Solution

The fourth proportional to 318.76, 478.42 and 156.58 is: 235.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.76 : 478.42 = 156.58 : x
  2. Step 2: Convert to fraction form
    318.76/478.42 = 156.58/x
  3. Step 3: Cross multiply
    318.76x = 478.42 × 156.58
  4. Step 4: Simplify right side
    318.76x = 74,911.00
  5. Step 5: Solve for x
    x = 74,911.00/318.76
  6. Step 6: Final answer
    x = 235.01

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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.