Home / 21,079.81-29,103.70-13,529.39

Finding the Fourth Proportional to 21,079.81, 29,103.70 and 13,529.39

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Solution

The fourth proportional to 21,079.81, 29,103.70 and 13,529.39 is: 18,679.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,079.81 : 29,103.70 = 13,529.39 : x
  2. Step 2: Convert to fraction form
    21,079.81/29,103.70 = 13,529.39/x
  3. Step 3: Cross multiply
    21,079.81x = 29,103.70 × 13,529.39
  4. Step 4: Simplify right side
    21,079.81x = 393,755,307.74
  5. Step 5: Solve for x
    x = 393,755,307.74/21,079.81
  6. Step 6: Final answer
    x = 18,679.26

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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.