Home / 20,315.60-30,491.40-11,985.20

Finding the Fourth Proportional to 20,315.60, 30,491.40 and 11,985.20

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Solution

The fourth proportional to 20,315.60, 30,491.40 and 11,985.20 is: 17,988.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,315.60 : 30,491.40 = 11,985.20 : x
  2. Step 2: Convert to fraction form
    20,315.60/30,491.40 = 11,985.20/x
  3. Step 3: Cross multiply
    20,315.60x = 30,491.40 × 11,985.20
  4. Step 4: Simplify right side
    20,315.60x = 365,445,527.28
  5. Step 5: Solve for x
    x = 365,445,527.28/20,315.60
  6. Step 6: Final answer
    x = 17,988.42

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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.