Home / 287,136.78-430,705.17-76,769.25

Finding the Fourth Proportional to 287,136.78, 430,705.17 and 76,769.25

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Solution

The fourth proportional to 287,136.78, 430,705.17 and 76,769.25 is: 115,153.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,136.78 : 430,705.17 = 76,769.25 : x
  2. Step 2: Convert to fraction form
    287,136.78/430,705.17 = 76,769.25/x
  3. Step 3: Cross multiply
    287,136.78x = 430,705.17 × 76,769.25
  4. Step 4: Simplify right side
    287,136.78x = 33,064,912,872.02
  5. Step 5: Solve for x
    x = 33,064,912,872.02/287,136.78
  6. Step 6: Final answer
    x = 115,153.88

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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.