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Finding the Fourth Proportional to 72,812.40, 100,476.84 and 40,980

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Solution

The fourth proportional to 72,812.40, 100,476.84 and 40,980 is: 56,550.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,812.40 : 100,476.84 = 40,980 : x
  2. Step 2: Convert to fraction form
    72,812.40/100,476.84 = 40,980/x
  3. Step 3: Cross multiply
    72,812.40x = 100,476.84 × 40,980
  4. Step 4: Simplify right side
    72,812.40x = 4,117,540,903.20
  5. Step 5: Solve for x
    x = 4,117,540,903.20/72,812.40
  6. Step 6: Final answer
    x = 56,550.00

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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.