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Finding the Fourth Proportional to 1,006.56, 1,389.36 and 613.76

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Solution

The fourth proportional to 1,006.56, 1,389.36 and 613.76 is: 847.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.56 : 1,389.36 = 613.76 : x
  2. Step 2: Convert to fraction form
    1,006.56/1,389.36 = 613.76/x
  3. Step 3: Cross multiply
    1,006.56x = 1,389.36 × 613.76
  4. Step 4: Simplify right side
    1,006.56x = 852,733.59
  5. Step 5: Solve for x
    x = 852,733.59/1,006.56
  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.