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Finding the Fourth Proportional to 1,006.91, 1,389.01 and 633.18

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Solution

The fourth proportional to 1,006.91, 1,389.01 and 633.18 is: 873.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.91 : 1,389.01 = 633.18 : x
  2. Step 2: Convert to fraction form
    1,006.91/1,389.01 = 633.18/x
  3. Step 3: Cross multiply
    1,006.91x = 1,389.01 × 633.18
  4. Step 4: Simplify right side
    1,006.91x = 879,498.16
  5. Step 5: Solve for x
    x = 879,498.16/1,006.91
  6. Step 6: Final answer
    x = 873.46

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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.