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Finding the Fourth Proportional to 1,005.50, 1,387.86 and 656.66

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Solution

The fourth proportional to 1,005.50, 1,387.86 and 656.66 is: 906.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.50 : 1,387.86 = 656.66 : x
  2. Step 2: Convert to fraction form
    1,005.50/1,387.86 = 656.66/x
  3. Step 3: Cross multiply
    1,005.50x = 1,387.86 × 656.66
  4. Step 4: Simplify right side
    1,005.50x = 911,352.15
  5. Step 5: Solve for x
    x = 911,352.15/1,005.50
  6. Step 6: Final answer
    x = 906.37

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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.