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Finding the Fourth Proportional to 687,215.20, 1,029,073.20 and 655,722.40

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Solution

The fourth proportional to 687,215.20, 1,029,073.20 and 655,722.40 is: 981,914.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,215.20 : 1,029,073.20 = 655,722.40 : x
  2. Step 2: Convert to fraction form
    687,215.20/1,029,073.20 = 655,722.40/x
  3. Step 3: Cross multiply
    687,215.20x = 1,029,073.20 × 655,722.40
  4. Step 4: Simplify right side
    687,215.20x = 674,786,348,479.68
  5. Step 5: Solve for x
    x = 674,786,348,479.68/687,215.20
  6. Step 6: Final answer
    x = 981,914.18

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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.