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Finding the Fourth Proportional to 1,006.90, 1,389.59 and 613.87

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Solution

The fourth proportional to 1,006.90, 1,389.59 and 613.87 is: 847.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.90 : 1,389.59 = 613.87 : x
  2. Step 2: Convert to fraction form
    1,006.90/1,389.59 = 613.87/x
  3. Step 3: Cross multiply
    1,006.90x = 1,389.59 × 613.87
  4. Step 4: Simplify right side
    1,006.90x = 853,023.37
  5. Step 5: Solve for x
    x = 853,023.37/1,006.90
  6. Step 6: Final answer
    x = 847.18

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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.