Home / 21,518.68-29,687.48-15,866.86

Finding the Fourth Proportional to 21,518.68, 29,687.48 and 15,866.86

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Solution

The fourth proportional to 21,518.68, 29,687.48 and 15,866.86 is: 21,890.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,518.68 : 29,687.48 = 15,866.86 : x
  2. Step 2: Convert to fraction form
    21,518.68/29,687.48 = 15,866.86/x
  3. Step 3: Cross multiply
    21,518.68x = 29,687.48 × 15,866.86
  4. Step 4: Simplify right side
    21,518.68x = 471,047,088.91
  5. Step 5: Solve for x
    x = 471,047,088.91/21,518.68
  6. Step 6: Final answer
    x = 21,890.15

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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.