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Finding the Fourth Proportional to 287,114.31, 430,638.66 and 76,768.65

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Solution

The fourth proportional to 287,114.31, 430,638.66 and 76,768.65 is: 115,144.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,114.31 : 430,638.66 = 76,768.65 : x
  2. Step 2: Convert to fraction form
    287,114.31/430,638.66 = 76,768.65/x
  3. Step 3: Cross multiply
    287,114.31x = 430,638.66 × 76,768.65
  4. Step 4: Simplify right side
    287,114.31x = 33,059,548,566.01
  5. Step 5: Solve for x
    x = 33,059,548,566.01/287,114.31
  6. Step 6: Final answer
    x = 115,144.20

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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.