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Finding the Fourth Proportional to 90,602.80, 135,904.20 and 77,480.80

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Solution

The fourth proportional to 90,602.80, 135,904.20 and 77,480.80 is: 116,221.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,602.80 : 135,904.20 = 77,480.80 : x
  2. Step 2: Convert to fraction form
    90,602.80/135,904.20 = 77,480.80/x
  3. Step 3: Cross multiply
    90,602.80x = 135,904.20 × 77,480.80
  4. Step 4: Simplify right side
    90,602.80x = 10,529,966,139.36
  5. Step 5: Solve for x
    x = 10,529,966,139.36/90,602.80
  6. Step 6: Final answer
    x = 116,221.20

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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.