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Finding the Fourth Proportional to 903.70, 1,355.93 and 579.70

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Solution

The fourth proportional to 903.70, 1,355.93 and 579.70 is: 869.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.70 : 1,355.93 = 579.70 : x
  2. Step 2: Convert to fraction form
    903.70/1,355.93 = 579.70/x
  3. Step 3: Cross multiply
    903.70x = 1,355.93 × 579.70
  4. Step 4: Simplify right side
    903.70x = 786,032.62
  5. Step 5: Solve for x
    x = 786,032.62/903.70
  6. Step 6: Final answer
    x = 869.79

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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.