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Finding the Fourth Proportional to 873.59, 1,205.89 and 578.75

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Solution

The fourth proportional to 873.59, 1,205.89 and 578.75 is: 798.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.59 : 1,205.89 = 578.75 : x
  2. Step 2: Convert to fraction form
    873.59/1,205.89 = 578.75/x
  3. Step 3: Cross multiply
    873.59x = 1,205.89 × 578.75
  4. Step 4: Simplify right side
    873.59x = 697,901.36
  5. Step 5: Solve for x
    x = 697,901.36/873.59
  6. Step 6: Final answer
    x = 798.89

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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.