Home / 81,639.40-122,361.90-42,176.20

Finding the Fourth Proportional to 81,639.40, 122,361.90 and 42,176.20

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Solution

The fourth proportional to 81,639.40, 122,361.90 and 42,176.20 is: 63,214.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,639.40 : 122,361.90 = 42,176.20 : x
  2. Step 2: Convert to fraction form
    81,639.40/122,361.90 = 42,176.20/x
  3. Step 3: Cross multiply
    81,639.40x = 122,361.90 × 42,176.20
  4. Step 4: Simplify right side
    81,639.40x = 5,160,759,966.78
  5. Step 5: Solve for x
    x = 5,160,759,966.78/81,639.40
  6. Step 6: Final answer
    x = 63,214.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.