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Finding the Fourth Proportional to 78,980.67, 118,468.58 and 26,390.61

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Solution

The fourth proportional to 78,980.67, 118,468.58 and 26,390.61 is: 39,585.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,980.67 : 118,468.58 = 26,390.61 : x
  2. Step 2: Convert to fraction form
    78,980.67/118,468.58 = 26,390.61/x
  3. Step 3: Cross multiply
    78,980.67x = 118,468.58 × 26,390.61
  4. Step 4: Simplify right side
    78,980.67x = 3,126,457,960.08
  5. Step 5: Solve for x
    x = 3,126,457,960.08/78,980.67
  6. Step 6: Final answer
    x = 39,585.10

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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.