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Finding the Fourth Proportional to 107.80, 148.64 and 100.52

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Solution

The fourth proportional to 107.80, 148.64 and 100.52 is: 138.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.80 : 148.64 = 100.52 : x
  2. Step 2: Convert to fraction form
    107.80/148.64 = 100.52/x
  3. Step 3: Cross multiply
    107.80x = 148.64 × 100.52
  4. Step 4: Simplify right side
    107.80x = 14,941.29
  5. Step 5: Solve for x
    x = 14,941.29/107.80
  6. Step 6: Final answer
    x = 138.60

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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.