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Finding the Fourth Proportional to 873.69, 1,205.70 and 480.70

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Solution

The fourth proportional to 873.69, 1,205.70 and 480.70 is: 663.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.69 : 1,205.70 = 480.70 : x
  2. Step 2: Convert to fraction form
    873.69/1,205.70 = 480.70/x
  3. Step 3: Cross multiply
    873.69x = 1,205.70 × 480.70
  4. Step 4: Simplify right side
    873.69x = 579,577.59
  5. Step 5: Solve for x
    x = 579,577.59/873.69
  6. Step 6: Final answer
    x = 663.37

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Double scale
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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.