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Finding the Fourth Proportional to 991.58, 1,487.34 and 406.44

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Solution

The fourth proportional to 991.58, 1,487.34 and 406.44 is: 609.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.58 : 1,487.34 = 406.44 : x
  2. Step 2: Convert to fraction form
    991.58/1,487.34 = 406.44/x
  3. Step 3: Cross multiply
    991.58x = 1,487.34 × 406.44
  4. Step 4: Simplify right side
    991.58x = 604,514.47
  5. Step 5: Solve for x
    x = 604,514.47/991.58
  6. Step 6: Final answer
    x = 609.65

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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.