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Finding the Fourth Proportional to 139.48, 210.18 and 115.63

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Solution

The fourth proportional to 139.48, 210.18 and 115.63 is: 174.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.48 : 210.18 = 115.63 : x
  2. Step 2: Convert to fraction form
    139.48/210.18 = 115.63/x
  3. Step 3: Cross multiply
    139.48x = 210.18 × 115.63
  4. Step 4: Simplify right side
    139.48x = 24,303.11
  5. Step 5: Solve for x
    x = 24,303.11/139.48
  6. Step 6: Final answer
    x = 174.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.