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Finding the Fourth Proportional to 172,381.50, 258,659.73 and 78,910.74

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Solution

The fourth proportional to 172,381.50, 258,659.73 and 78,910.74 is: 118,406.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,381.50 : 258,659.73 = 78,910.74 : x
  2. Step 2: Convert to fraction form
    172,381.50/258,659.73 = 78,910.74/x
  3. Step 3: Cross multiply
    172,381.50x = 258,659.73 × 78,910.74
  4. Step 4: Simplify right side
    172,381.50x = 20,411,030,702.50
  5. Step 5: Solve for x
    x = 20,411,030,702.50/172,381.50
  6. Step 6: Final answer
    x = 118,406.16

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1.5x scale

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.