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Finding the Fourth Proportional to 85,920.40, 128,880.60 and 76,880.80

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Solution

The fourth proportional to 85,920.40, 128,880.60 and 76,880.80 is: 115,321.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.40 : 128,880.60 = 76,880.80 : x
  2. Step 2: Convert to fraction form
    85,920.40/128,880.60 = 76,880.80/x
  3. Step 3: Cross multiply
    85,920.40x = 128,880.60 × 76,880.80
  4. Step 4: Simplify right side
    85,920.40x = 9,908,443,632.48
  5. Step 5: Solve for x
    x = 9,908,443,632.48/85,920.40
  6. Step 6: Final answer
    x = 115,321.20

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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.