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Finding the Fourth Proportional to 921.84, 1,382.82 and 435.36

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Solution

The fourth proportional to 921.84, 1,382.82 and 435.36 is: 653.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.84 : 1,382.82 = 435.36 : x
  2. Step 2: Convert to fraction form
    921.84/1,382.82 = 435.36/x
  3. Step 3: Cross multiply
    921.84x = 1,382.82 × 435.36
  4. Step 4: Simplify right side
    921.84x = 602,024.52
  5. Step 5: Solve for x
    x = 602,024.52/921.84
  6. Step 6: Final answer
    x = 653.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.