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Finding the Fourth Proportional to 916.87, 1,375.73 and 670.30

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Solution

The fourth proportional to 916.87, 1,375.73 and 670.30 is: 1,005.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.87 : 1,375.73 = 670.30 : x
  2. Step 2: Convert to fraction form
    916.87/1,375.73 = 670.30/x
  3. Step 3: Cross multiply
    916.87x = 1,375.73 × 670.30
  4. Step 4: Simplify right side
    916.87x = 922,151.82
  5. Step 5: Solve for x
    x = 922,151.82/916.87
  6. Step 6: Final answer
    x = 1,005.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.