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Finding the Fourth Proportional to 72,560.64, 100,139.94 and 40,301.45

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Solution

The fourth proportional to 72,560.64, 100,139.94 and 40,301.45 is: 55,619.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,560.64 : 100,139.94 = 40,301.45 : x
  2. Step 2: Convert to fraction form
    72,560.64/100,139.94 = 40,301.45/x
  3. Step 3: Cross multiply
    72,560.64x = 100,139.94 × 40,301.45
  4. Step 4: Simplify right side
    72,560.64x = 4,035,784,284.21
  5. Step 5: Solve for x
    x = 4,035,784,284.21/72,560.64
  6. Step 6: Final answer
    x = 55,619.47

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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.