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Finding the Fourth Proportional to 983.75, 1,476.12 and 436.29

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Solution

The fourth proportional to 983.75, 1,476.12 and 436.29 is: 654.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.75 : 1,476.12 = 436.29 : x
  2. Step 2: Convert to fraction form
    983.75/1,476.12 = 436.29/x
  3. Step 3: Cross multiply
    983.75x = 1,476.12 × 436.29
  4. Step 4: Simplify right side
    983.75x = 644,012.50
  5. Step 5: Solve for x
    x = 644,012.50/983.75
  6. Step 6: Final answer
    x = 654.65

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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.