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Finding the Fourth Proportional to 72,701.44, 100,328 and 40,870.40

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Solution

The fourth proportional to 72,701.44, 100,328 and 40,870.40 is: 56,401.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,701.44 : 100,328 = 40,870.40 : x
  2. Step 2: Convert to fraction form
    72,701.44/100,328 = 40,870.40/x
  3. Step 3: Cross multiply
    72,701.44x = 100,328 × 40,870.40
  4. Step 4: Simplify right side
    72,701.44x = 4,100,445,491.20
  5. Step 5: Solve for x
    x = 4,100,445,491.20/72,701.44
  6. Step 6: Final answer
    x = 56,401.16

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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.