Home / 39,779.81-54,897.55-21,876.18

Finding the Fourth Proportional to 39,779.81, 54,897.55 and 21,876.18

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Solution

The fourth proportional to 39,779.81, 54,897.55 and 21,876.18 is: 30,189.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,779.81 : 54,897.55 = 21,876.18 : x
  2. Step 2: Convert to fraction form
    39,779.81/54,897.55 = 21,876.18/x
  3. Step 3: Cross multiply
    39,779.81x = 54,897.55 × 21,876.18
  4. Step 4: Simplify right side
    39,779.81x = 1,200,948,356.18
  5. Step 5: Solve for x
    x = 1,200,948,356.18/39,779.81
  6. Step 6: Final answer
    x = 30,189.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.