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Finding the Fourth Proportional to 1,007.29, 1,390.07 and 559.17

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Solution

The fourth proportional to 1,007.29, 1,390.07 and 559.17 is: 771.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.29 : 1,390.07 = 559.17 : x
  2. Step 2: Convert to fraction form
    1,007.29/1,390.07 = 559.17/x
  3. Step 3: Cross multiply
    1,007.29x = 1,390.07 × 559.17
  4. Step 4: Simplify right side
    1,007.29x = 777,285.44
  5. Step 5: Solve for x
    x = 777,285.44/1,007.29
  6. Step 6: Final answer
    x = 771.66

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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.