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Finding the Fourth Proportional to 78,779.01, 118,107.94 and 40,787.56

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Solution

The fourth proportional to 78,779.01, 118,107.94 and 40,787.56 is: 61,149.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,779.01 : 118,107.94 = 40,787.56 : x
  2. Step 2: Convert to fraction form
    78,779.01/118,107.94 = 40,787.56/x
  3. Step 3: Cross multiply
    78,779.01x = 118,107.94 × 40,787.56
  4. Step 4: Simplify right side
    78,779.01x = 4,817,334,689.23
  5. Step 5: Solve for x
    x = 4,817,334,689.23/78,779.01
  6. Step 6: Final answer
    x = 61,149.98

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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.