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Finding the Fourth Proportional to 118,872.37, 178,319.59 and 42,989.90

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Solution

The fourth proportional to 118,872.37, 178,319.59 and 42,989.90 is: 64,488.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,872.37 : 178,319.59 = 42,989.90 : x
  2. Step 2: Convert to fraction form
    118,872.37/178,319.59 = 42,989.90/x
  3. Step 3: Cross multiply
    118,872.37x = 178,319.59 × 42,989.90
  4. Step 4: Simplify right side
    118,872.37x = 7,665,941,342.14
  5. Step 5: Solve for x
    x = 7,665,941,342.14/118,872.37
  6. Step 6: Final answer
    x = 64,488.84

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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.