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Finding the Fourth Proportional to 570.19, 858.39 and 388.73

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Solution

The fourth proportional to 570.19, 858.39 and 388.73 is: 585.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.19 : 858.39 = 388.73 : x
  2. Step 2: Convert to fraction form
    570.19/858.39 = 388.73/x
  3. Step 3: Cross multiply
    570.19x = 858.39 × 388.73
  4. Step 4: Simplify right side
    570.19x = 333,681.94
  5. Step 5: Solve for x
    x = 333,681.94/570.19
  6. Step 6: Final answer
    x = 585.22

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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.