Home / 20,579.80-28,400.16-11,148.40

Finding the Fourth Proportional to 20,579.80, 28,400.16 and 11,148.40

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Solution

The fourth proportional to 20,579.80, 28,400.16 and 11,148.40 is: 15,384.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,579.80 : 28,400.16 = 11,148.40 : x
  2. Step 2: Convert to fraction form
    20,579.80/28,400.16 = 11,148.40/x
  3. Step 3: Cross multiply
    20,579.80x = 28,400.16 × 11,148.40
  4. Step 4: Simplify right side
    20,579.80x = 316,616,343.74
  5. Step 5: Solve for x
    x = 316,616,343.74/20,579.80
  6. Step 6: Final answer
    x = 15,384.81

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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.