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Finding the Fourth Proportional to 639,831.80, 960,078.90 and 261,030.20

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Solution

The fourth proportional to 639,831.80, 960,078.90 and 261,030.20 is: 391,680.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,831.80 : 960,078.90 = 261,030.20 : x
  2. Step 2: Convert to fraction form
    639,831.80/960,078.90 = 261,030.20/x
  3. Step 3: Cross multiply
    639,831.80x = 960,078.90 × 261,030.20
  4. Step 4: Simplify right side
    639,831.80x = 250,609,587,282.78
  5. Step 5: Solve for x
    x = 250,609,587,282.78/639,831.80
  6. Step 6: Final answer
    x = 391,680.42

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1.5x scale

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.