Home / 20,876.18-28,776.40-15,820.16

Finding the Fourth Proportional to 20,876.18, 28,776.40 and 15,820.16

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Solution

The fourth proportional to 20,876.18, 28,776.40 and 15,820.16 is: 21,807.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.18 : 28,776.40 = 15,820.16 : x
  2. Step 2: Convert to fraction form
    20,876.18/28,776.40 = 15,820.16/x
  3. Step 3: Cross multiply
    20,876.18x = 28,776.40 × 15,820.16
  4. Step 4: Simplify right side
    20,876.18x = 455,247,068.79
  5. Step 5: Solve for x
    x = 455,247,068.79/20,876.18
  6. Step 6: Final answer
    x = 21,807.02

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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.