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Finding the Fourth Proportional to 152.78, 228.87 and 71.51

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Solution

The fourth proportional to 152.78, 228.87 and 71.51 is: 107.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.78 : 228.87 = 71.51 : x
  2. Step 2: Convert to fraction form
    152.78/228.87 = 71.51/x
  3. Step 3: Cross multiply
    152.78x = 228.87 × 71.51
  4. Step 4: Simplify right side
    152.78x = 16,366.49
  5. Step 5: Solve for x
    x = 16,366.49/152.78
  6. Step 6: Final answer
    x = 107.12

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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.