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Finding the Fourth Proportional to 1,679.61, 2,520.99 and 858.47

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Solution

The fourth proportional to 1,679.61, 2,520.99 and 858.47 is: 1,288.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.61 : 2,520.99 = 858.47 : x
  2. Step 2: Convert to fraction form
    1,679.61/2,520.99 = 858.47/x
  3. Step 3: Cross multiply
    1,679.61x = 2,520.99 × 858.47
  4. Step 4: Simplify right side
    1,679.61x = 2,164,194.29
  5. Step 5: Solve for x
    x = 2,164,194.29/1,679.61
  6. Step 6: Final answer
    x = 1,288.51

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1.5x scale

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.