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Finding the Fourth Proportional to 858.98, 1,285.61 and 782.12

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Solution

The fourth proportional to 858.98, 1,285.61 and 782.12 is: 1,170.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.98 : 1,285.61 = 782.12 : x
  2. Step 2: Convert to fraction form
    858.98/1,285.61 = 782.12/x
  3. Step 3: Cross multiply
    858.98x = 1,285.61 × 782.12
  4. Step 4: Simplify right side
    858.98x = 1,005,496.82
  5. Step 5: Solve for x
    x = 1,005,496.82/858.98
  6. Step 6: Final answer
    x = 1,170.58

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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.