Home / 432,078.20-648,117.30-390,087.80

Finding the Fourth Proportional to 432,078.20, 648,117.30 and 390,087.80

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Solution

The fourth proportional to 432,078.20, 648,117.30 and 390,087.80 is: 585,131.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,078.20 : 648,117.30 = 390,087.80 : x
  2. Step 2: Convert to fraction form
    432,078.20/648,117.30 = 390,087.80/x
  3. Step 3: Cross multiply
    432,078.20x = 648,117.30 × 390,087.80
  4. Step 4: Simplify right side
    432,078.20x = 252,822,651,698.94
  5. Step 5: Solve for x
    x = 252,822,651,698.94/432,078.20
  6. Step 6: Final answer
    x = 585,131.70

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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.