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Finding the Fourth Proportional to 921.15, 1,278.23 and 885.51

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Solution

The fourth proportional to 921.15, 1,278.23 and 885.51 is: 1,228.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.15 : 1,278.23 = 885.51 : x
  2. Step 2: Convert to fraction form
    921.15/1,278.23 = 885.51/x
  3. Step 3: Cross multiply
    921.15x = 1,278.23 × 885.51
  4. Step 4: Simplify right side
    921.15x = 1,131,881.02
  5. Step 5: Solve for x
    x = 1,131,881.02/921.15
  6. Step 6: Final answer
    x = 1,228.77

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.