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Finding the Fourth Proportional to 90,666.60, 135,999.90 and 85,828.20

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Solution

The fourth proportional to 90,666.60, 135,999.90 and 85,828.20 is: 128,742.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,666.60 : 135,999.90 = 85,828.20 : x
  2. Step 2: Convert to fraction form
    90,666.60/135,999.90 = 85,828.20/x
  3. Step 3: Cross multiply
    90,666.60x = 135,999.90 × 85,828.20
  4. Step 4: Simplify right side
    90,666.60x = 11,672,626,617.18
  5. Step 5: Solve for x
    x = 11,672,626,617.18/90,666.60
  6. Step 6: Final answer
    x = 128,742.30

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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.