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Finding the Fourth Proportional to 158.78, 238.15 and 56.07

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Solution

The fourth proportional to 158.78, 238.15 and 56.07 is: 84.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.78 : 238.15 = 56.07 : x
  2. Step 2: Convert to fraction form
    158.78/238.15 = 56.07/x
  3. Step 3: Cross multiply
    158.78x = 238.15 × 56.07
  4. Step 4: Simplify right side
    158.78x = 13,352.48
  5. Step 5: Solve for x
    x = 13,352.48/158.78
  6. Step 6: Final answer
    x = 84.09

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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.