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Finding the Fourth Proportional to 870,672.80, 1,306,009.20 and 807,687.20

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Solution

The fourth proportional to 870,672.80, 1,306,009.20 and 807,687.20 is: 1,211,530.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,672.80 : 1,306,009.20 = 807,687.20 : x
  2. Step 2: Convert to fraction form
    870,672.80/1,306,009.20 = 807,687.20/x
  3. Step 3: Cross multiply
    870,672.80x = 1,306,009.20 × 807,687.20
  4. Step 4: Simplify right side
    870,672.80x = 1,054,846,913,922.24
  5. Step 5: Solve for x
    x = 1,054,846,913,922.24/870,672.80
  6. Step 6: Final answer
    x = 1,211,530.80

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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.