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Finding the Fourth Proportional to 90,615.84, 135,005.16 and 86,154.56

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Solution

The fourth proportional to 90,615.84, 135,005.16 and 86,154.56 is: 128,358.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,615.84 : 135,005.16 = 86,154.56 : x
  2. Step 2: Convert to fraction form
    90,615.84/135,005.16 = 86,154.56/x
  3. Step 3: Cross multiply
    90,615.84x = 135,005.16 × 86,154.56
  4. Step 4: Simplify right side
    90,615.84x = 11,631,310,157.53
  5. Step 5: Solve for x
    x = 11,631,310,157.53/90,615.84
  6. Step 6: Final answer
    x = 128,358.47

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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.