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Finding the Fourth Proportional to 983.46, 1,475.28 and 290.28

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Solution

The fourth proportional to 983.46, 1,475.28 and 290.28 is: 435.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.46 : 1,475.28 = 290.28 : x
  2. Step 2: Convert to fraction form
    983.46/1,475.28 = 290.28/x
  3. Step 3: Cross multiply
    983.46x = 1,475.28 × 290.28
  4. Step 4: Simplify right side
    983.46x = 428,244.28
  5. Step 5: Solve for x
    x = 428,244.28/983.46
  6. Step 6: Final answer
    x = 435.45

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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.