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Finding the Fourth Proportional to 1,007.21, 1,389.98 and 587.49

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Solution

The fourth proportional to 1,007.21, 1,389.98 and 587.49 is: 810.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.21 : 1,389.98 = 587.49 : x
  2. Step 2: Convert to fraction form
    1,007.21/1,389.98 = 587.49/x
  3. Step 3: Cross multiply
    1,007.21x = 1,389.98 × 587.49
  4. Step 4: Simplify right side
    1,007.21x = 816,596.41
  5. Step 5: Solve for x
    x = 816,596.41/1,007.21
  6. Step 6: Final answer
    x = 810.75

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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.