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Finding the Fourth Proportional to 105,438.80, 157,927.80 and 81,880.40

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Solution

The fourth proportional to 105,438.80, 157,927.80 and 81,880.40 is: 122,641.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,438.80 : 157,927.80 = 81,880.40 : x
  2. Step 2: Convert to fraction form
    105,438.80/157,927.80 = 81,880.40/x
  3. Step 3: Cross multiply
    105,438.80x = 157,927.80 × 81,880.40
  4. Step 4: Simplify right side
    105,438.80x = 12,931,191,435.12
  5. Step 5: Solve for x
    x = 12,931,191,435.12/105,438.80
  6. Step 6: Final answer
    x = 122,641.68

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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.