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Finding the Fourth Proportional to 72,820.81, 100,490.67 and 40,555.41

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Solution

The fourth proportional to 72,820.81, 100,490.67 and 40,555.41 is: 55,965.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,820.81 : 100,490.67 = 40,555.41 : x
  2. Step 2: Convert to fraction form
    72,820.81/100,490.67 = 40,555.41/x
  3. Step 3: Cross multiply
    72,820.81x = 100,490.67 × 40,555.41
  4. Step 4: Simplify right side
    72,820.81x = 4,075,440,851.95
  5. Step 5: Solve for x
    x = 4,075,440,851.95/72,820.81
  6. Step 6: Final answer
    x = 55,965.33

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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.