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Finding the Fourth Proportional to 287,665.67, 431,515.81 and 87,987.79

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Solution

The fourth proportional to 287,665.67, 431,515.81 and 87,987.79 is: 131,986.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,665.67 : 431,515.81 = 87,987.79 : x
  2. Step 2: Convert to fraction form
    287,665.67/431,515.81 = 87,987.79/x
  3. Step 3: Cross multiply
    287,665.67x = 431,515.81 × 87,987.79
  4. Step 4: Simplify right side
    287,665.67x = 37,968,122,390.79
  5. Step 5: Solve for x
    x = 37,968,122,390.79/287,665.67
  6. Step 6: Final answer
    x = 131,986.98

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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.