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Finding the Fourth Proportional to 1,006.91, 1,389.56 and 558.79

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Solution

The fourth proportional to 1,006.91, 1,389.56 and 558.79 is: 771.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.91 : 1,389.56 = 558.79 : x
  2. Step 2: Convert to fraction form
    1,006.91/1,389.56 = 558.79/x
  3. Step 3: Cross multiply
    1,006.91x = 1,389.56 × 558.79
  4. Step 4: Simplify right side
    1,006.91x = 776,468.76
  5. Step 5: Solve for x
    x = 776,468.76/1,006.91
  6. Step 6: Final answer
    x = 771.14

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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.