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Finding the Fourth Proportional to 936.32, 1,290.98 and 853.08

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Solution

The fourth proportional to 936.32, 1,290.98 and 853.08 is: 1,176.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.32 : 1,290.98 = 853.08 : x
  2. Step 2: Convert to fraction form
    936.32/1,290.98 = 853.08/x
  3. Step 3: Cross multiply
    936.32x = 1,290.98 × 853.08
  4. Step 4: Simplify right side
    936.32x = 1,101,309.22
  5. Step 5: Solve for x
    x = 1,101,309.22/936.32
  6. Step 6: Final answer
    x = 1,176.21

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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.