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Finding the Fourth Proportional to 72,134.78, 99,542.80 and 40,303

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Solution

The fourth proportional to 72,134.78, 99,542.80 and 40,303 is: 55,616.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,134.78 : 99,542.80 = 40,303 : x
  2. Step 2: Convert to fraction form
    72,134.78/99,542.80 = 40,303/x
  3. Step 3: Cross multiply
    72,134.78x = 99,542.80 × 40,303
  4. Step 4: Simplify right side
    72,134.78x = 4,011,873,468.40
  5. Step 5: Solve for x
    x = 4,011,873,468.40/72,134.78
  6. Step 6: Final answer
    x = 55,616.35

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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.