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Finding the Fourth Proportional to 90,617.84, 135,008.14 and 86,156.56

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Solution

The fourth proportional to 90,617.84, 135,008.14 and 86,156.56 is: 128,361.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,617.84 : 135,008.14 = 86,156.56 : x
  2. Step 2: Convert to fraction form
    90,617.84/135,008.14 = 86,156.56/x
  3. Step 3: Cross multiply
    90,617.84x = 135,008.14 × 86,156.56
  4. Step 4: Simplify right side
    90,617.84x = 11,631,836,914.40
  5. Step 5: Solve for x
    x = 11,631,836,914.40/90,617.84
  6. Step 6: Final answer
    x = 128,361.45

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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.