Home / 21,210.90-29,270.48-11,778.86

Finding the Fourth Proportional to 21,210.90, 29,270.48 and 11,778.86

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Solution

The fourth proportional to 21,210.90, 29,270.48 and 11,778.86 is: 16,254.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,210.90 : 29,270.48 = 11,778.86 : x
  2. Step 2: Convert to fraction form
    21,210.90/29,270.48 = 11,778.86/x
  3. Step 3: Cross multiply
    21,210.90x = 29,270.48 × 11,778.86
  4. Step 4: Simplify right side
    21,210.90x = 344,772,680.81
  5. Step 5: Solve for x
    x = 344,772,680.81/21,210.90
  6. Step 6: Final answer
    x = 16,254.51

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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.