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Finding the Fourth Proportional to 78,219.79, 117,277.84 and 28,293.31

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Solution

The fourth proportional to 78,219.79, 117,277.84 and 28,293.31 is: 42,421.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,219.79 : 117,277.84 = 28,293.31 : x
  2. Step 2: Convert to fraction form
    78,219.79/117,277.84 = 28,293.31/x
  3. Step 3: Cross multiply
    78,219.79x = 117,277.84 × 28,293.31
  4. Step 4: Simplify right side
    78,219.79x = 3,318,178,283.25
  5. Step 5: Solve for x
    x = 3,318,178,283.25/78,219.79
  6. Step 6: Final answer
    x = 42,421.21

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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.