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Finding the Fourth Proportional to 90,649.84, 135,899.88 and 40,012.80

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Solution

The fourth proportional to 90,649.84, 135,899.88 and 40,012.80 is: 59,986.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,649.84 : 135,899.88 = 40,012.80 : x
  2. Step 2: Convert to fraction form
    90,649.84/135,899.88 = 40,012.80/x
  3. Step 3: Cross multiply
    90,649.84x = 135,899.88 × 40,012.80
  4. Step 4: Simplify right side
    90,649.84x = 5,437,734,718.46
  5. Step 5: Solve for x
    x = 5,437,734,718.46/90,649.84
  6. Step 6: Final answer
    x = 59,986.15

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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.