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Finding the Fourth Proportional to 152.19, 228.06 and 87.21

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Solution

The fourth proportional to 152.19, 228.06 and 87.21 is: 130.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.19 : 228.06 = 87.21 : x
  2. Step 2: Convert to fraction form
    152.19/228.06 = 87.21/x
  3. Step 3: Cross multiply
    152.19x = 228.06 × 87.21
  4. Step 4: Simplify right side
    152.19x = 19,889.11
  5. Step 5: Solve for x
    x = 19,889.11/152.19
  6. Step 6: Final answer
    x = 130.69

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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.