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Finding the Fourth Proportional to 72,021.60, 108,032.40 and 47,089.80

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Solution

The fourth proportional to 72,021.60, 108,032.40 and 47,089.80 is: 70,634.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,021.60 : 108,032.40 = 47,089.80 : x
  2. Step 2: Convert to fraction form
    72,021.60/108,032.40 = 47,089.80/x
  3. Step 3: Cross multiply
    72,021.60x = 108,032.40 × 47,089.80
  4. Step 4: Simplify right side
    72,021.60x = 5,087,224,109.52
  5. Step 5: Solve for x
    x = 5,087,224,109.52/72,021.60
  6. Step 6: Final answer
    x = 70,634.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.