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Finding the Fourth Proportional to 72,138.80, 108,208.20 and 42,570.80

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Solution

The fourth proportional to 72,138.80, 108,208.20 and 42,570.80 is: 63,856.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,138.80 : 108,208.20 = 42,570.80 : x
  2. Step 2: Convert to fraction form
    72,138.80/108,208.20 = 42,570.80/x
  3. Step 3: Cross multiply
    72,138.80x = 108,208.20 × 42,570.80
  4. Step 4: Simplify right side
    72,138.80x = 4,606,509,640.56
  5. Step 5: Solve for x
    x = 4,606,509,640.56/72,138.80
  6. Step 6: Final answer
    x = 63,856.20

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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.