Home / 42,390-63,556.92-20,206.80

Finding the Fourth Proportional to 42,390, 63,556.92 and 20,206.80

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Solution

The fourth proportional to 42,390, 63,556.92 and 20,206.80 is: 30,296.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,390 : 63,556.92 = 20,206.80 : x
  2. Step 2: Convert to fraction form
    42,390/63,556.92 = 20,206.80/x
  3. Step 3: Cross multiply
    42,390x = 63,556.92 × 20,206.80
  4. Step 4: Simplify right side
    42,390x = 1,284,281,971.06
  5. Step 5: Solve for x
    x = 1,284,281,971.06/42,390
  6. Step 6: Final answer
    x = 30,296.81

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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.