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Finding the Fourth Proportional to 855.60, 1,180.39 and 603.89

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Solution

The fourth proportional to 855.60, 1,180.39 and 603.89 is: 833.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.60 : 1,180.39 = 603.89 : x
  2. Step 2: Convert to fraction form
    855.60/1,180.39 = 603.89/x
  3. Step 3: Cross multiply
    855.60x = 1,180.39 × 603.89
  4. Step 4: Simplify right side
    855.60x = 712,828.81
  5. Step 5: Solve for x
    x = 712,828.81/855.60
  6. Step 6: Final answer
    x = 833.13

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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.