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Finding the Fourth Proportional to 66,361.90, 91,572.78 and 40,864.18

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Solution

The fourth proportional to 66,361.90, 91,572.78 and 40,864.18 is: 56,388.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,361.90 : 91,572.78 = 40,864.18 : x
  2. Step 2: Convert to fraction form
    66,361.90/91,572.78 = 40,864.18/x
  3. Step 3: Cross multiply
    66,361.90x = 91,572.78 × 40,864.18
  4. Step 4: Simplify right side
    66,361.90x = 3,742,046,565.02
  5. Step 5: Solve for x
    x = 3,742,046,565.02/66,361.90
  6. Step 6: Final answer
    x = 56,388.48

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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.