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Finding the Fourth Proportional to 1,005.99, 1,388.43 and 607.98

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Solution

The fourth proportional to 1,005.99, 1,388.43 and 607.98 is: 839.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.99 : 1,388.43 = 607.98 : x
  2. Step 2: Convert to fraction form
    1,005.99/1,388.43 = 607.98/x
  3. Step 3: Cross multiply
    1,005.99x = 1,388.43 × 607.98
  4. Step 4: Simplify right side
    1,005.99x = 844,137.67
  5. Step 5: Solve for x
    x = 844,137.67/1,005.99
  6. Step 6: Final answer
    x = 839.11

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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.