Home / 20,779.80-31,131.30-19,397.40

Finding the Fourth Proportional to 20,779.80, 31,131.30 and 19,397.40

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Solution

The fourth proportional to 20,779.80, 31,131.30 and 19,397.40 is: 29,060.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.80 : 31,131.30 = 19,397.40 : x
  2. Step 2: Convert to fraction form
    20,779.80/31,131.30 = 19,397.40/x
  3. Step 3: Cross multiply
    20,779.80x = 31,131.30 × 19,397.40
  4. Step 4: Simplify right side
    20,779.80x = 603,866,278.62
  5. Step 5: Solve for x
    x = 603,866,278.62/20,779.80
  6. Step 6: Final answer
    x = 29,060.25

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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.