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Finding the Fourth Proportional to 858.40, 1,285.08 and 532.78

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Solution

The fourth proportional to 858.40, 1,285.08 and 532.78 is: 797.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.40 : 1,285.08 = 532.78 : x
  2. Step 2: Convert to fraction form
    858.40/1,285.08 = 532.78/x
  3. Step 3: Cross multiply
    858.40x = 1,285.08 × 532.78
  4. Step 4: Simplify right side
    858.40x = 684,664.92
  5. Step 5: Solve for x
    x = 684,664.92/858.40
  6. Step 6: Final answer
    x = 797.61

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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.