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Finding the Fourth Proportional to 103,486.10, 155,229.15 and 85,990.10

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Solution

The fourth proportional to 103,486.10, 155,229.15 and 85,990.10 is: 128,985.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,486.10 : 155,229.15 = 85,990.10 : x
  2. Step 2: Convert to fraction form
    103,486.10/155,229.15 = 85,990.10/x
  3. Step 3: Cross multiply
    103,486.10x = 155,229.15 × 85,990.10
  4. Step 4: Simplify right side
    103,486.10x = 13,348,170,131.42
  5. Step 5: Solve for x
    x = 13,348,170,131.42/103,486.10
  6. Step 6: Final answer
    x = 128,985.15

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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.