Home / 21,000.79-29,008.70-15,686.38

Finding the Fourth Proportional to 21,000.79, 29,008.70 and 15,686.38

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Solution

The fourth proportional to 21,000.79, 29,008.70 and 15,686.38 is: 21,667.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.79 : 29,008.70 = 15,686.38 : x
  2. Step 2: Convert to fraction form
    21,000.79/29,008.70 = 15,686.38/x
  3. Step 3: Cross multiply
    21,000.79x = 29,008.70 × 15,686.38
  4. Step 4: Simplify right side
    21,000.79x = 455,041,491.51
  5. Step 5: Solve for x
    x = 455,041,491.51/21,000.79
  6. Step 6: Final answer
    x = 21,667.83

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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.