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Finding the Fourth Proportional to 128,684.79, 177,363.23 and 85,587.21

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Solution

The fourth proportional to 128,684.79, 177,363.23 and 85,587.21 is: 117,962.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,684.79 : 177,363.23 = 85,587.21 : x
  2. Step 2: Convert to fraction form
    128,684.79/177,363.23 = 85,587.21/x
  3. Step 3: Cross multiply
    128,684.79x = 177,363.23 × 85,587.21
  4. Step 4: Simplify right side
    128,684.79x = 15,180,023,584.35
  5. Step 5: Solve for x
    x = 15,180,023,584.35/128,684.79
  6. Step 6: Final answer
    x = 117,962.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.