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Finding the Fourth Proportional to 172,750.60, 258,981.90 and 72,987.40

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Solution

The fourth proportional to 172,750.60, 258,981.90 and 72,987.40 is: 109,420.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,750.60 : 258,981.90 = 72,987.40 : x
  2. Step 2: Convert to fraction form
    172,750.60/258,981.90 = 72,987.40/x
  3. Step 3: Cross multiply
    172,750.60x = 258,981.90 × 72,987.40
  4. Step 4: Simplify right side
    172,750.60x = 18,902,415,528.06
  5. Step 5: Solve for x
    x = 18,902,415,528.06/172,750.60
  6. Step 6: Final answer
    x = 109,420.26

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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.