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Finding the Fourth Proportional to 107.85, 148.80 and 64.18

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Solution

The fourth proportional to 107.85, 148.80 and 64.18 is: 88.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.85 : 148.80 = 64.18 : x
  2. Step 2: Convert to fraction form
    107.85/148.80 = 64.18/x
  3. Step 3: Cross multiply
    107.85x = 148.80 × 64.18
  4. Step 4: Simplify right side
    107.85x = 9,549.93
  5. Step 5: Solve for x
    x = 9,549.93/107.85
  6. Step 6: Final answer
    x = 88.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.