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Finding the Fourth Proportional to 1,011.63, 1,395.45 and 638.48

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Solution

The fourth proportional to 1,011.63, 1,395.45 and 638.48 is: 880.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.63 : 1,395.45 = 638.48 : x
  2. Step 2: Convert to fraction form
    1,011.63/1,395.45 = 638.48/x
  3. Step 3: Cross multiply
    1,011.63x = 1,395.45 × 638.48
  4. Step 4: Simplify right side
    1,011.63x = 890,959.94
  5. Step 5: Solve for x
    x = 890,959.94/1,011.63
  6. Step 6: Final answer
    x = 880.72

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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.