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Finding the Fourth Proportional to 612.69, 918.90 and 247.20

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Solution

The fourth proportional to 612.69, 918.90 and 247.20 is: 370.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.69 : 918.90 = 247.20 : x
  2. Step 2: Convert to fraction form
    612.69/918.90 = 247.20/x
  3. Step 3: Cross multiply
    612.69x = 918.90 × 247.20
  4. Step 4: Simplify right side
    612.69x = 227,152.08
  5. Step 5: Solve for x
    x = 227,152.08/612.69
  6. Step 6: Final answer
    x = 370.75

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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.