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Finding the Fourth Proportional to 72,640.47, 100,226.20 and 42,408.48

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Solution

The fourth proportional to 72,640.47, 100,226.20 and 42,408.48 is: 58,513.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,640.47 : 100,226.20 = 42,408.48 : x
  2. Step 2: Convert to fraction form
    72,640.47/100,226.20 = 42,408.48/x
  3. Step 3: Cross multiply
    72,640.47x = 100,226.20 × 42,408.48
  4. Step 4: Simplify right side
    72,640.47x = 4,250,440,798.18
  5. Step 5: Solve for x
    x = 4,250,440,798.18/72,640.47
  6. Step 6: Final answer
    x = 58,513.40

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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.