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Finding the Fourth Proportional to 870,407.60, 1,305,611.40 and 571,809.20

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Solution

The fourth proportional to 870,407.60, 1,305,611.40 and 571,809.20 is: 857,713.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    870,407.60 : 1,305,611.40 = 571,809.20 : x
  2. Step 2: Convert to fraction form
    870,407.60/1,305,611.40 = 571,809.20/x
  3. Step 3: Cross multiply
    870,407.60x = 1,305,611.40 × 571,809.20
  4. Step 4: Simplify right side
    870,407.60x = 746,560,610,144.88
  5. Step 5: Solve for x
    x = 746,560,610,144.88/870,407.60
  6. Step 6: Final answer
    x = 857,713.80

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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.