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Finding the Fourth Proportional to 1,094.19, 1,509.55 and 721.37

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Solution

The fourth proportional to 1,094.19, 1,509.55 and 721.37 is: 995.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,094.19 : 1,509.55 = 721.37 : x
  2. Step 2: Convert to fraction form
    1,094.19/1,509.55 = 721.37/x
  3. Step 3: Cross multiply
    1,094.19x = 1,509.55 × 721.37
  4. Step 4: Simplify right side
    1,094.19x = 1,088,944.08
  5. Step 5: Solve for x
    x = 1,088,944.08/1,094.19
  6. Step 6: Final answer
    x = 995.21

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Half scale
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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.