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Finding the Fourth Proportional to 152.88, 229.32 and 128.40

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Solution

The fourth proportional to 152.88, 229.32 and 128.40 is: 192.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.88 : 229.32 = 128.40 : x
  2. Step 2: Convert to fraction form
    152.88/229.32 = 128.40/x
  3. Step 3: Cross multiply
    152.88x = 229.32 × 128.40
  4. Step 4: Simplify right side
    152.88x = 29,444.69
  5. Step 5: Solve for x
    x = 29,444.69/152.88
  6. Step 6: Final answer
    x = 192.60

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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.