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Finding the Fourth Proportional to 920.15, 1,368.97 and 884.51

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Solution

The fourth proportional to 920.15, 1,368.97 and 884.51 is: 1,315.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.15 : 1,368.97 = 884.51 : x
  2. Step 2: Convert to fraction form
    920.15/1,368.97 = 884.51/x
  3. Step 3: Cross multiply
    920.15x = 1,368.97 × 884.51
  4. Step 4: Simplify right side
    920.15x = 1,210,867.65
  5. Step 5: Solve for x
    x = 1,210,867.65/920.15
  6. Step 6: Final answer
    x = 1,315.95

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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.