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Finding the Fourth Proportional to 621.84, 858.14 and 342.08

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Solution

The fourth proportional to 621.84, 858.14 and 342.08 is: 472.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.84 : 858.14 = 342.08 : x
  2. Step 2: Convert to fraction form
    621.84/858.14 = 342.08/x
  3. Step 3: Cross multiply
    621.84x = 858.14 × 342.08
  4. Step 4: Simplify right side
    621.84x = 293,552.53
  5. Step 5: Solve for x
    x = 293,552.53/621.84
  6. Step 6: Final answer
    x = 472.07

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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.