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Finding the Fourth Proportional to 15,865.20, 21,901.08 and 11,410.80

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Solution

The fourth proportional to 15,865.20, 21,901.08 and 11,410.80 is: 15,752.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,865.20 : 21,901.08 = 11,410.80 : x
  2. Step 2: Convert to fraction form
    15,865.20/21,901.08 = 11,410.80/x
  3. Step 3: Cross multiply
    15,865.20x = 21,901.08 × 11,410.80
  4. Step 4: Simplify right side
    15,865.20x = 249,908,843.66
  5. Step 5: Solve for x
    x = 249,908,843.66/15,865.20
  6. Step 6: Final answer
    x = 15,752.01

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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.