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Finding the Fourth Proportional to 1,083.70, 1,495.24 and 641.71

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Solution

The fourth proportional to 1,083.70, 1,495.24 and 641.71 is: 885.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.70 : 1,495.24 = 641.71 : x
  2. Step 2: Convert to fraction form
    1,083.70/1,495.24 = 641.71/x
  3. Step 3: Cross multiply
    1,083.70x = 1,495.24 × 641.71
  4. Step 4: Simplify right side
    1,083.70x = 959,510.46
  5. Step 5: Solve for x
    x = 959,510.46/1,083.70
  6. Step 6: Final answer
    x = 885.40

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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.