Home / 21,871.99-30,151.08-15,478.72

Finding the Fourth Proportional to 21,871.99, 30,151.08 and 15,478.72

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Solution

The fourth proportional to 21,871.99, 30,151.08 and 15,478.72 is: 21,337.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,871.99 : 30,151.08 = 15,478.72 : x
  2. Step 2: Convert to fraction form
    21,871.99/30,151.08 = 15,478.72/x
  3. Step 3: Cross multiply
    21,871.99x = 30,151.08 × 15,478.72
  4. Step 4: Simplify right side
    21,871.99x = 466,700,125.02
  5. Step 5: Solve for x
    x = 466,700,125.02/21,871.99
  6. Step 6: Final answer
    x = 21,337.80

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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.