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Finding the Fourth Proportional to 72,408.15, 99,923.40 and 40,143.30

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Solution

The fourth proportional to 72,408.15, 99,923.40 and 40,143.30 is: 55,397.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,408.15 : 99,923.40 = 40,143.30 : x
  2. Step 2: Convert to fraction form
    72,408.15/99,923.40 = 40,143.30/x
  3. Step 3: Cross multiply
    72,408.15x = 99,923.40 × 40,143.30
  4. Step 4: Simplify right side
    72,408.15x = 4,011,255,023.22
  5. Step 5: Solve for x
    x = 4,011,255,023.22/72,408.15
  6. Step 6: Final answer
    x = 55,397.84

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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.