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Finding the Fourth Proportional to 90,880.80, 136,321.20 and 57,638.40

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Solution

The fourth proportional to 90,880.80, 136,321.20 and 57,638.40 is: 86,457.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,880.80 : 136,321.20 = 57,638.40 : x
  2. Step 2: Convert to fraction form
    90,880.80/136,321.20 = 57,638.40/x
  3. Step 3: Cross multiply
    90,880.80x = 136,321.20 × 57,638.40
  4. Step 4: Simplify right side
    90,880.80x = 7,857,335,854.08
  5. Step 5: Solve for x
    x = 7,857,335,854.08/90,880.80
  6. Step 6: Final answer
    x = 86,457.60

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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.