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Finding the Fourth Proportional to 90,881.80, 136,322.70 and 57,639.40

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Solution

The fourth proportional to 90,881.80, 136,322.70 and 57,639.40 is: 86,459.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,881.80 : 136,322.70 = 57,639.40 : x
  2. Step 2: Convert to fraction form
    90,881.80/136,322.70 = 57,639.40/x
  3. Step 3: Cross multiply
    90,881.80x = 136,322.70 × 57,639.40
  4. Step 4: Simplify right side
    90,881.80x = 7,857,558,634.38
  5. Step 5: Solve for x
    x = 7,857,558,634.38/90,881.80
  6. Step 6: Final answer
    x = 86,459.10

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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.