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Finding the Fourth Proportional to 85,392.60, 128,088.90 and 43,920.60

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Solution

The fourth proportional to 85,392.60, 128,088.90 and 43,920.60 is: 65,880.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,392.60 : 128,088.90 = 43,920.60 : x
  2. Step 2: Convert to fraction form
    85,392.60/128,088.90 = 43,920.60/x
  3. Step 3: Cross multiply
    85,392.60x = 128,088.90 × 43,920.60
  4. Step 4: Simplify right side
    85,392.60x = 5,625,741,341.34
  5. Step 5: Solve for x
    x = 5,625,741,341.34/85,392.60
  6. Step 6: Final answer
    x = 65,880.90

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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.