Home / 21,076.65-31,590.63-7,920.63

Finding the Fourth Proportional to 21,076.65, 31,590.63 and 7,920.63

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Solution

The fourth proportional to 21,076.65, 31,590.63 and 7,920.63 is: 11,871.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,076.65 : 31,590.63 = 7,920.63 : x
  2. Step 2: Convert to fraction form
    21,076.65/31,590.63 = 7,920.63/x
  3. Step 3: Cross multiply
    21,076.65x = 31,590.63 × 7,920.63
  4. Step 4: Simplify right side
    21,076.65x = 250,217,691.70
  5. Step 5: Solve for x
    x = 250,217,691.70/21,076.65
  6. Step 6: Final answer
    x = 11,871.80

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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.