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Finding the Fourth Proportional to 72,605.89, 100,196.53 and 40,340.55

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Solution

The fourth proportional to 72,605.89, 100,196.53 and 40,340.55 is: 55,670.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,605.89 : 100,196.53 = 40,340.55 : x
  2. Step 2: Convert to fraction form
    72,605.89/100,196.53 = 40,340.55/x
  3. Step 3: Cross multiply
    72,605.89x = 100,196.53 × 40,340.55
  4. Step 4: Simplify right side
    72,605.89x = 4,041,983,128.29
  5. Step 5: Solve for x
    x = 4,041,983,128.29/72,605.89
  6. Step 6: Final answer
    x = 55,670.18

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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.