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Finding the Fourth Proportional to 873.69, 1,205.69 and 480.70

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Solution

The fourth proportional to 873.69, 1,205.69 and 480.70 is: 663.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.69 : 1,205.69 = 480.70 : x
  2. Step 2: Convert to fraction form
    873.69/1,205.69 = 480.70/x
  3. Step 3: Cross multiply
    873.69x = 1,205.69 × 480.70
  4. Step 4: Simplify right side
    873.69x = 579,575.18
  5. Step 5: Solve for x
    x = 579,575.18/873.69
  6. Step 6: Final answer
    x = 663.36

Related Problems

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Half scale
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Double scale
Find fourth proportional to 874.69, 1,207.07 and 481.70
Similar ratio
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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.