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Finding the Fourth Proportional to 873.75, 1,205.78 and 480.80

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Solution

The fourth proportional to 873.75, 1,205.78 and 480.80 is: 663.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.75 : 1,205.78 = 480.80 : x
  2. Step 2: Convert to fraction form
    873.75/1,205.78 = 480.80/x
  3. Step 3: Cross multiply
    873.75x = 1,205.78 × 480.80
  4. Step 4: Simplify right side
    873.75x = 579,730.59
  5. Step 5: Solve for x
    x = 579,730.59/873.75
  6. Step 6: Final answer
    x = 663.50

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1.5x scale

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.