Home / 21,865.68-30,161.16-15,580.08

Finding the Fourth Proportional to 21,865.68, 30,161.16 and 15,580.08

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Solution

The fourth proportional to 21,865.68, 30,161.16 and 15,580.08 is: 21,490.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,865.68 : 30,161.16 = 15,580.08 : x
  2. Step 2: Convert to fraction form
    21,865.68/30,161.16 = 15,580.08/x
  3. Step 3: Cross multiply
    21,865.68x = 30,161.16 × 15,580.08
  4. Step 4: Simplify right side
    21,865.68x = 469,913,285.69
  5. Step 5: Solve for x
    x = 469,913,285.69/21,865.68
  6. Step 6: Final answer
    x = 21,490.91

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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.