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Finding the Fourth Proportional to 1,007.07, 1,389.67 and 587.42

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Solution

The fourth proportional to 1,007.07, 1,389.67 and 587.42 is: 810.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.07 : 1,389.67 = 587.42 : x
  2. Step 2: Convert to fraction form
    1,007.07/1,389.67 = 587.42/x
  3. Step 3: Cross multiply
    1,007.07x = 1,389.67 × 587.42
  4. Step 4: Simplify right side
    1,007.07x = 816,319.95
  5. Step 5: Solve for x
    x = 816,319.95/1,007.07
  6. Step 6: Final answer
    x = 810.59

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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.