Home / 90,840.20-136,130.70-66,961.40

Finding the Fourth Proportional to 90,840.20, 136,130.70 and 66,961.40

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Solution

The fourth proportional to 90,840.20, 136,130.70 and 66,961.40 is: 100,346.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,840.20 : 136,130.70 = 66,961.40 : x
  2. Step 2: Convert to fraction form
    90,840.20/136,130.70 = 66,961.40/x
  3. Step 3: Cross multiply
    90,840.20x = 136,130.70 × 66,961.40
  4. Step 4: Simplify right side
    90,840.20x = 9,115,502,254.98
  5. Step 5: Solve for x
    x = 9,115,502,254.98/90,840.20
  6. Step 6: Final answer
    x = 100,346.57

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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.