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Finding the Fourth Proportional to 612.99, 918.78 and 305.06

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Solution

The fourth proportional to 612.99, 918.78 and 305.06 is: 457.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.99 : 918.78 = 305.06 : x
  2. Step 2: Convert to fraction form
    612.99/918.78 = 305.06/x
  3. Step 3: Cross multiply
    612.99x = 918.78 × 305.06
  4. Step 4: Simplify right side
    612.99x = 280,278.43
  5. Step 5: Solve for x
    x = 280,278.43/612.99
  6. Step 6: Final answer
    x = 457.23

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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.