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Finding the Fourth Proportional to 1,021.84, 1,409.16 and 912.40

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Solution

The fourth proportional to 1,021.84, 1,409.16 and 912.40 is: 1,258.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.84 : 1,409.16 = 912.40 : x
  2. Step 2: Convert to fraction form
    1,021.84/1,409.16 = 912.40/x
  3. Step 3: Cross multiply
    1,021.84x = 1,409.16 × 912.40
  4. Step 4: Simplify right side
    1,021.84x = 1,285,717.58
  5. Step 5: Solve for x
    x = 1,285,717.58/1,021.84
  6. Step 6: Final answer
    x = 1,258.24

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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.