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Finding the Fourth Proportional to 72,655.36, 100,309.12 and 57,608.80

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Solution

The fourth proportional to 72,655.36, 100,309.12 and 57,608.80 is: 79,535.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,655.36 : 100,309.12 = 57,608.80 : x
  2. Step 2: Convert to fraction form
    72,655.36/100,309.12 = 57,608.80/x
  3. Step 3: Cross multiply
    72,655.36x = 100,309.12 × 57,608.80
  4. Step 4: Simplify right side
    72,655.36x = 5,778,688,032.26
  5. Step 5: Solve for x
    x = 5,778,688,032.26/72,655.36
  6. Step 6: Final answer
    x = 79,535.61

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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.