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Finding the Fourth Proportional to 103,489.60, 155,234.40 and 85,993.60

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Solution

The fourth proportional to 103,489.60, 155,234.40 and 85,993.60 is: 128,990.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,489.60 : 155,234.40 = 85,993.60 : x
  2. Step 2: Convert to fraction form
    103,489.60/155,234.40 = 85,993.60/x
  3. Step 3: Cross multiply
    103,489.60x = 155,234.40 × 85,993.60
  4. Step 4: Simplify right side
    103,489.60x = 13,349,164,899.84
  5. Step 5: Solve for x
    x = 13,349,164,899.84/103,489.60
  6. Step 6: Final answer
    x = 128,990.40

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Double scale
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Similar ratio
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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.