Home / 20,315.48-30,445.53-12,420.74

Finding the Fourth Proportional to 20,315.48, 30,445.53 and 12,420.74

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Solution

The fourth proportional to 20,315.48, 30,445.53 and 12,420.74 is: 18,614.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,315.48 : 30,445.53 = 12,420.74 : x
  2. Step 2: Convert to fraction form
    20,315.48/30,445.53 = 12,420.74/x
  3. Step 3: Cross multiply
    20,315.48x = 30,445.53 × 12,420.74
  4. Step 4: Simplify right side
    20,315.48x = 378,156,088.41
  5. Step 5: Solve for x
    x = 378,156,088.41/20,315.48
  6. Step 6: Final answer
    x = 18,614.19

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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.