Home / 20,378.90-28,122.86-12,421.10

Finding the Fourth Proportional to 20,378.90, 28,122.86 and 12,421.10

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Solution

The fourth proportional to 20,378.90, 28,122.86 and 12,421.10 is: 17,141.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.90 : 28,122.86 = 12,421.10 : x
  2. Step 2: Convert to fraction form
    20,378.90/28,122.86 = 12,421.10/x
  3. Step 3: Cross multiply
    20,378.90x = 28,122.86 × 12,421.10
  4. Step 4: Simplify right side
    20,378.90x = 349,316,856.35
  5. Step 5: Solve for x
    x = 349,316,856.35/20,378.90
  6. Step 6: Final answer
    x = 17,141.10

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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.