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Finding the Fourth Proportional to 115,008.60, 172,512.90 and 109,990.20

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Solution

The fourth proportional to 115,008.60, 172,512.90 and 109,990.20 is: 164,985.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,008.60 : 172,512.90 = 109,990.20 : x
  2. Step 2: Convert to fraction form
    115,008.60/172,512.90 = 109,990.20/x
  3. Step 3: Cross multiply
    115,008.60x = 172,512.90 × 109,990.20
  4. Step 4: Simplify right side
    115,008.60x = 18,974,728,373.58
  5. Step 5: Solve for x
    x = 18,974,728,373.58/115,008.60
  6. Step 6: Final answer
    x = 164,985.30

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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.