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Finding the Fourth Proportional to 858.14, 1,285.50 and 395.28

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Solution

The fourth proportional to 858.14, 1,285.50 and 395.28 is: 592.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.14 : 1,285.50 = 395.28 : x
  2. Step 2: Convert to fraction form
    858.14/1,285.50 = 395.28/x
  3. Step 3: Cross multiply
    858.14x = 1,285.50 × 395.28
  4. Step 4: Simplify right side
    858.14x = 508,133.92
  5. Step 5: Solve for x
    x = 508,133.92/858.14
  6. Step 6: Final answer
    x = 592.13

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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.