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Finding the Fourth Proportional to 853.04, 1,177.20 and 485.04

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Solution

The fourth proportional to 853.04, 1,177.20 and 485.04 is: 669.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.04 : 1,177.20 = 485.04 : x
  2. Step 2: Convert to fraction form
    853.04/1,177.20 = 485.04/x
  3. Step 3: Cross multiply
    853.04x = 1,177.20 × 485.04
  4. Step 4: Simplify right side
    853.04x = 570,989.09
  5. Step 5: Solve for x
    x = 570,989.09/853.04
  6. Step 6: Final answer
    x = 669.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.