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Finding the Fourth Proportional to 611.20, 916.20 and 303.10

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Solution

The fourth proportional to 611.20, 916.20 and 303.10 is: 454.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.20 : 916.20 = 303.10 : x
  2. Step 2: Convert to fraction form
    611.20/916.20 = 303.10/x
  3. Step 3: Cross multiply
    611.20x = 916.20 × 303.10
  4. Step 4: Simplify right side
    611.20x = 277,700.22
  5. Step 5: Solve for x
    x = 277,700.22/611.20
  6. Step 6: Final answer
    x = 454.35

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.