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Finding the Fourth Proportional to 90,635.80, 135,953.70 and 77,513.80

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Solution

The fourth proportional to 90,635.80, 135,953.70 and 77,513.80 is: 116,270.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,635.80 : 135,953.70 = 77,513.80 : x
  2. Step 2: Convert to fraction form
    90,635.80/135,953.70 = 77,513.80/x
  3. Step 3: Cross multiply
    90,635.80x = 135,953.70 × 77,513.80
  4. Step 4: Simplify right side
    90,635.80x = 10,538,287,911.06
  5. Step 5: Solve for x
    x = 10,538,287,911.06/90,635.80
  6. Step 6: Final answer
    x = 116,270.70

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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.