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Finding the Fourth Proportional to 912.39, 1,360.91 and 885.06

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Solution

The fourth proportional to 912.39, 1,360.91 and 885.06 is: 1,320.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.39 : 1,360.91 = 885.06 : x
  2. Step 2: Convert to fraction form
    912.39/1,360.91 = 885.06/x
  3. Step 3: Cross multiply
    912.39x = 1,360.91 × 885.06
  4. Step 4: Simplify right side
    912.39x = 1,204,482.58
  5. Step 5: Solve for x
    x = 1,204,482.58/912.39
  6. Step 6: Final answer
    x = 1,320.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.