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Finding the Fourth Proportional to 991.08, 1,485.72 and 414.36

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Solution

The fourth proportional to 991.08, 1,485.72 and 414.36 is: 621.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.08 : 1,485.72 = 414.36 : x
  2. Step 2: Convert to fraction form
    991.08/1,485.72 = 414.36/x
  3. Step 3: Cross multiply
    991.08x = 1,485.72 × 414.36
  4. Step 4: Simplify right side
    991.08x = 615,622.94
  5. Step 5: Solve for x
    x = 615,622.94/991.08
  6. Step 6: Final answer
    x = 621.16

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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.