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Finding the Fourth Proportional to 1,106.88, 1,527.68 and 641.40

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Solution

The fourth proportional to 1,106.88, 1,527.68 and 641.40 is: 885.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.88 : 1,527.68 = 641.40 : x
  2. Step 2: Convert to fraction form
    1,106.88/1,527.68 = 641.40/x
  3. Step 3: Cross multiply
    1,106.88x = 1,527.68 × 641.40
  4. Step 4: Simplify right side
    1,106.88x = 979,853.95
  5. Step 5: Solve for x
    x = 979,853.95/1,106.88
  6. Step 6: Final answer
    x = 885.24

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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.