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Finding the Fourth Proportional to 125.80, 188.64 and 64.90

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Solution

The fourth proportional to 125.80, 188.64 and 64.90 is: 97.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.80 : 188.64 = 64.90 : x
  2. Step 2: Convert to fraction form
    125.80/188.64 = 64.90/x
  3. Step 3: Cross multiply
    125.80x = 188.64 × 64.90
  4. Step 4: Simplify right side
    125.80x = 12,242.74
  5. Step 5: Solve for x
    x = 12,242.74/125.80
  6. Step 6: Final answer
    x = 97.32

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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.