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Finding the Fourth Proportional to 21,478.59, 29,626.81 and 15,519.01

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Solution

The fourth proportional to 21,478.59, 29,626.81 and 15,519.01 is: 21,406.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,478.59 : 29,626.81 = 15,519.01 : x
  2. Step 2: Convert to fraction form
    21,478.59/29,626.81 = 15,519.01/x
  3. Step 3: Cross multiply
    21,478.59x = 29,626.81 × 15,519.01
  4. Step 4: Simplify right side
    21,478.59x = 459,778,760.66
  5. Step 5: Solve for x
    x = 459,778,760.66/21,478.59
  6. Step 6: Final answer
    x = 21,406.38

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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.