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Finding the Fourth Proportional to 991.34, 1,486.92 and 414.08

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Solution

The fourth proportional to 991.34, 1,486.92 and 414.08 is: 621.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.34 : 1,486.92 = 414.08 : x
  2. Step 2: Convert to fraction form
    991.34/1,486.92 = 414.08/x
  3. Step 3: Cross multiply
    991.34x = 1,486.92 × 414.08
  4. Step 4: Simplify right side
    991.34x = 615,703.83
  5. Step 5: Solve for x
    x = 615,703.83/991.34
  6. Step 6: Final answer
    x = 621.08

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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.