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Finding the Fourth Proportional to 1,011.84, 1,397.25 and 639.48

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Solution

The fourth proportional to 1,011.84, 1,397.25 and 639.48 is: 883.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.84 : 1,397.25 = 639.48 : x
  2. Step 2: Convert to fraction form
    1,011.84/1,397.25 = 639.48/x
  3. Step 3: Cross multiply
    1,011.84x = 1,397.25 × 639.48
  4. Step 4: Simplify right side
    1,011.84x = 893,513.43
  5. Step 5: Solve for x
    x = 893,513.43/1,011.84
  6. Step 6: Final answer
    x = 883.06

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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.