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Finding the Fourth Proportional to 272,710.20, 409,065.30 and 85,721.70

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Solution

The fourth proportional to 272,710.20, 409,065.30 and 85,721.70 is: 128,582.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,710.20 : 409,065.30 = 85,721.70 : x
  2. Step 2: Convert to fraction form
    272,710.20/409,065.30 = 85,721.70/x
  3. Step 3: Cross multiply
    272,710.20x = 409,065.30 × 85,721.70
  4. Step 4: Simplify right side
    272,710.20x = 35,065,772,927.01
  5. Step 5: Solve for x
    x = 35,065,772,927.01/272,710.20
  6. Step 6: Final answer
    x = 128,582.55

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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.