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Finding the Fourth Proportional to 991.47, 1,486.76 and 342.03

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Solution

The fourth proportional to 991.47, 1,486.76 and 342.03 is: 512.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.47 : 1,486.76 = 342.03 : x
  2. Step 2: Convert to fraction form
    991.47/1,486.76 = 342.03/x
  3. Step 3: Cross multiply
    991.47x = 1,486.76 × 342.03
  4. Step 4: Simplify right side
    991.47x = 508,514.81
  5. Step 5: Solve for x
    x = 508,514.81/991.47
  6. Step 6: Final answer
    x = 512.89

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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.