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Finding the Fourth Proportional to 916.58, 1,377.26 and 856.59

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Solution

The fourth proportional to 916.58, 1,377.26 and 856.59 is: 1,287.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.58 : 1,377.26 = 856.59 : x
  2. Step 2: Convert to fraction form
    916.58/1,377.26 = 856.59/x
  3. Step 3: Cross multiply
    916.58x = 1,377.26 × 856.59
  4. Step 4: Simplify right side
    916.58x = 1,179,747.14
  5. Step 5: Solve for x
    x = 1,179,747.14/916.58
  6. Step 6: Final answer
    x = 1,287.12

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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.