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Finding the Fourth Proportional to 287,668.09, 431,502 and 87,988.51

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Solution

The fourth proportional to 287,668.09, 431,502 and 87,988.51 is: 131,982.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,668.09 : 431,502 = 87,988.51 : x
  2. Step 2: Convert to fraction form
    287,668.09/431,502 = 87,988.51/x
  3. Step 3: Cross multiply
    287,668.09x = 431,502 × 87,988.51
  4. Step 4: Simplify right side
    287,668.09x = 37,967,218,042.02
  5. Step 5: Solve for x
    x = 37,967,218,042.02/287,668.09
  6. Step 6: Final answer
    x = 131,982.72

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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.