Home / 21,007.20-31,498.65-7,860.90

Finding the Fourth Proportional to 21,007.20, 31,498.65 and 7,860.90

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Solution

The fourth proportional to 21,007.20, 31,498.65 and 7,860.90 is: 11,786.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.20 : 31,498.65 = 7,860.90 : x
  2. Step 2: Convert to fraction form
    21,007.20/31,498.65 = 7,860.90/x
  3. Step 3: Cross multiply
    21,007.20x = 31,498.65 × 7,860.90
  4. Step 4: Simplify right side
    21,007.20x = 247,607,737.79
  5. Step 5: Solve for x
    x = 247,607,737.79/21,007.20
  6. Step 6: Final answer
    x = 11,786.80

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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.