Home / 287,668.08-431,432.91-87,990.21

Finding the Fourth Proportional to 287,668.08, 431,432.91 and 87,990.21

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Solution

The fourth proportional to 287,668.08, 431,432.91 and 87,990.21 is: 131,964.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,668.08 : 431,432.91 = 87,990.21 : x
  2. Step 2: Convert to fraction form
    287,668.08/431,432.91 = 87,990.21/x
  3. Step 3: Cross multiply
    287,668.08x = 431,432.91 × 87,990.21
  4. Step 4: Simplify right side
    287,668.08x = 37,961,872,351.81
  5. Step 5: Solve for x
    x = 37,961,872,351.81/287,668.08
  6. Step 6: Final answer
    x = 131,964.15

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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.