Home / 642,470.16-886,631.88-387,771.60

Finding the Fourth Proportional to 642,470.16, 886,631.88 and 387,771.60

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Solution

The fourth proportional to 642,470.16, 886,631.88 and 387,771.60 is: 535,138.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,470.16 : 886,631.88 = 387,771.60 : x
  2. Step 2: Convert to fraction form
    642,470.16/886,631.88 = 387,771.60/x
  3. Step 3: Cross multiply
    642,470.16x = 886,631.88 × 387,771.60
  4. Step 4: Simplify right side
    642,470.16x = 343,810,662,718.61
  5. Step 5: Solve for x
    x = 343,810,662,718.61/642,470.16
  6. Step 6: Final answer
    x = 535,138.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.