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Finding the Fourth Proportional to 272,948.80, 409,480.80 and 85,979.20

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Solution

The fourth proportional to 272,948.80, 409,480.80 and 85,979.20 is: 128,986.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,948.80 : 409,480.80 = 85,979.20 : x
  2. Step 2: Convert to fraction form
    272,948.80/409,480.80 = 85,979.20/x
  3. Step 3: Cross multiply
    272,948.80x = 409,480.80 × 85,979.20
  4. Step 4: Simplify right side
    272,948.80x = 35,206,831,599.36
  5. Step 5: Solve for x
    x = 35,206,831,599.36/272,948.80
  6. Step 6: Final answer
    x = 128,986.94

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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.