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Finding the Fourth Proportional to 621.93, 858.26 and 342.19

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Solution

The fourth proportional to 621.93, 858.26 and 342.19 is: 472.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.93 : 858.26 = 342.19 : x
  2. Step 2: Convert to fraction form
    621.93/858.26 = 342.19/x
  3. Step 3: Cross multiply
    621.93x = 858.26 × 342.19
  4. Step 4: Simplify right side
    621.93x = 293,687.99
  5. Step 5: Solve for x
    x = 293,687.99/621.93
  6. Step 6: Final answer
    x = 472.22

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