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Finding the Fourth Proportional to 85,418.63, 127,250.99 and 81,580.49

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Solution

The fourth proportional to 85,418.63, 127,250.99 and 81,580.49 is: 121,533.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,418.63 : 127,250.99 = 81,580.49 : x
  2. Step 2: Convert to fraction form
    85,418.63/127,250.99 = 81,580.49/x
  3. Step 3: Cross multiply
    85,418.63x = 127,250.99 × 81,580.49
  4. Step 4: Simplify right side
    85,418.63x = 10,381,198,117.19
  5. Step 5: Solve for x
    x = 10,381,198,117.19/85,418.63
  6. Step 6: Final answer
    x = 121,533.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.