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Finding the Fourth Proportional to 878.40, 1,317.62 and 603.66

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Solution

The fourth proportional to 878.40, 1,317.62 and 603.66 is: 905.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.40 : 1,317.62 = 603.66 : x
  2. Step 2: Convert to fraction form
    878.40/1,317.62 = 603.66/x
  3. Step 3: Cross multiply
    878.40x = 1,317.62 × 603.66
  4. Step 4: Simplify right side
    878.40x = 795,391.47
  5. Step 5: Solve for x
    x = 795,391.47/878.40
  6. Step 6: Final answer
    x = 905.50

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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.