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Finding the Fourth Proportional to 1,005.99, 1,387.00 and 651.32

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Solution

The fourth proportional to 1,005.99, 1,387.00 and 651.32 is: 897.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.99 : 1,387.00 = 651.32 : x
  2. Step 2: Convert to fraction form
    1,005.99/1,387.00 = 651.32/x
  3. Step 3: Cross multiply
    1,005.99x = 1,387.00 × 651.32
  4. Step 4: Simplify right side
    1,005.99x = 903,372.28
  5. Step 5: Solve for x
    x = 903,372.28/1,005.99
  6. Step 6: Final answer
    x = 897.99

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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.