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Finding the Fourth Proportional to 90,628.80, 135,943.20 and 57,386.40

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Solution

The fourth proportional to 90,628.80, 135,943.20 and 57,386.40 is: 86,079.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,628.80 : 135,943.20 = 57,386.40 : x
  2. Step 2: Convert to fraction form
    90,628.80/135,943.20 = 57,386.40/x
  3. Step 3: Cross multiply
    90,628.80x = 135,943.20 × 57,386.40
  4. Step 4: Simplify right side
    90,628.80x = 7,801,290,852.48
  5. Step 5: Solve for x
    x = 7,801,290,852.48/90,628.80
  6. Step 6: Final answer
    x = 86,079.60

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Similar ratio
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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.