Home / 30,905.11-42,555-28,055.17

Finding the Fourth Proportional to 30,905.11, 42,555 and 28,055.17

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Solution

The fourth proportional to 30,905.11, 42,555 and 28,055.17 is: 38,630.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,905.11 : 42,555 = 28,055.17 : x
  2. Step 2: Convert to fraction form
    30,905.11/42,555 = 28,055.17/x
  3. Step 3: Cross multiply
    30,905.11x = 42,555 × 28,055.17
  4. Step 4: Simplify right side
    30,905.11x = 1,193,887,759.35
  5. Step 5: Solve for x
    x = 1,193,887,759.35/30,905.11
  6. Step 6: Final answer
    x = 38,630.76

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Half scale
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Double scale
Find fourth proportional to 30,906.11, 42,556.38 and 28,056.17
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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.