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Finding the Fourth Proportional to 981.98, 1,473.14 and 434.18

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Solution

The fourth proportional to 981.98, 1,473.14 and 434.18 is: 651.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.98 : 1,473.14 = 434.18 : x
  2. Step 2: Convert to fraction form
    981.98/1,473.14 = 434.18/x
  3. Step 3: Cross multiply
    981.98x = 1,473.14 × 434.18
  4. Step 4: Simplify right side
    981.98x = 639,601.64
  5. Step 5: Solve for x
    x = 639,601.64/981.98
  6. Step 6: Final answer
    x = 651.34

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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.