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Finding the Fourth Proportional to 90,411.40, 135,638.70 and 43,625.80

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Solution

The fourth proportional to 90,411.40, 135,638.70 and 43,625.80 is: 65,449.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,411.40 : 135,638.70 = 43,625.80 : x
  2. Step 2: Convert to fraction form
    90,411.40/135,638.70 = 43,625.80/x
  3. Step 3: Cross multiply
    90,411.40x = 135,638.70 × 43,625.80
  4. Step 4: Simplify right side
    90,411.40x = 5,917,346,798.46
  5. Step 5: Solve for x
    x = 5,917,346,798.46/90,411.40
  6. Step 6: Final answer
    x = 65,449.12

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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.