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Finding the Fourth Proportional to 72,987.60, 100,722.84 and 39,453.60

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Solution

The fourth proportional to 72,987.60, 100,722.84 and 39,453.60 is: 54,445.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,987.60 : 100,722.84 = 39,453.60 : x
  2. Step 2: Convert to fraction form
    72,987.60/100,722.84 = 39,453.60/x
  3. Step 3: Cross multiply
    72,987.60x = 100,722.84 × 39,453.60
  4. Step 4: Simplify right side
    72,987.60x = 3,973,878,640.22
  5. Step 5: Solve for x
    x = 3,973,878,640.22/72,987.60
  6. Step 6: Final answer
    x = 54,445.94

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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.