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Finding the Fourth Proportional to 611.68, 921.27 and 555.63

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Solution

The fourth proportional to 611.68, 921.27 and 555.63 is: 836.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.68 : 921.27 = 555.63 : x
  2. Step 2: Convert to fraction form
    611.68/921.27 = 555.63/x
  3. Step 3: Cross multiply
    611.68x = 921.27 × 555.63
  4. Step 4: Simplify right side
    611.68x = 511,891.65
  5. Step 5: Solve for x
    x = 511,891.65/611.68
  6. Step 6: Final answer
    x = 836.87

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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 (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.