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Finding the Fourth Proportional to 39,486.72, 54,491.55 and 21,581.72

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Solution

The fourth proportional to 39,486.72, 54,491.55 and 21,581.72 is: 29,782.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,486.72 : 54,491.55 = 21,581.72 : x
  2. Step 2: Convert to fraction form
    39,486.72/54,491.55 = 21,581.72/x
  3. Step 3: Cross multiply
    39,486.72x = 54,491.55 × 21,581.72
  4. Step 4: Simplify right side
    39,486.72x = 1,176,021,102.01
  5. Step 5: Solve for x
    x = 1,176,021,102.01/39,486.72
  6. Step 6: Final answer
    x = 29,782.70

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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.