Home / 21,285.91-31,879.65-20,547.80

Finding the Fourth Proportional to 21,285.91, 31,879.65 and 20,547.80

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Solution

The fourth proportional to 21,285.91, 31,879.65 and 20,547.80 is: 30,774.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,285.91 : 31,879.65 = 20,547.80 : x
  2. Step 2: Convert to fraction form
    21,285.91/31,879.65 = 20,547.80/x
  3. Step 3: Cross multiply
    21,285.91x = 31,879.65 × 20,547.80
  4. Step 4: Simplify right side
    21,285.91x = 655,056,672.27
  5. Step 5: Solve for x
    x = 655,056,672.27/21,285.91
  6. Step 6: Final answer
    x = 30,774.19

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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.