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Finding the Fourth Proportional to 72,987.36, 100,722.49 and 39,453.36

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Solution

The fourth proportional to 72,987.36, 100,722.49 and 39,453.36 is: 54,445.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,987.36 : 100,722.49 = 39,453.36 : x
  2. Step 2: Convert to fraction form
    72,987.36/100,722.49 = 39,453.36/x
  3. Step 3: Cross multiply
    72,987.36x = 100,722.49 × 39,453.36
  4. Step 4: Simplify right side
    72,987.36x = 3,973,840,658.07
  5. Step 5: Solve for x
    x = 3,973,840,658.07/72,987.36
  6. Step 6: Final answer
    x = 54,445.60

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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.