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Finding the Fourth Proportional to 853.51, 1,177.89 and 480.50

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Solution

The fourth proportional to 853.51, 1,177.89 and 480.50 is: 663.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.51 : 1,177.89 = 480.50 : x
  2. Step 2: Convert to fraction form
    853.51/1,177.89 = 480.50/x
  3. Step 3: Cross multiply
    853.51x = 1,177.89 × 480.50
  4. Step 4: Simplify right side
    853.51x = 565,979.09
  5. Step 5: Solve for x
    x = 565,979.09/853.51
  6. Step 6: Final answer
    x = 663.12

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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.