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Finding the Fourth Proportional to 169.58, 253.80 and 128.77

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Solution

The fourth proportional to 169.58, 253.80 and 128.77 is: 192.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.58 : 253.80 = 128.77 : x
  2. Step 2: Convert to fraction form
    169.58/253.80 = 128.77/x
  3. Step 3: Cross multiply
    169.58x = 253.80 × 128.77
  4. Step 4: Simplify right side
    169.58x = 32,681.19
  5. Step 5: Solve for x
    x = 32,681.19/169.58
  6. Step 6: Final answer
    x = 192.72

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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.