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Finding the Fourth Proportional to 1,639.10, 2,458.02 and 858.50

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Solution

The fourth proportional to 1,639.10, 2,458.02 and 858.50 is: 1,287.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.10 : 2,458.02 = 858.50 : x
  2. Step 2: Convert to fraction form
    1,639.10/2,458.02 = 858.50/x
  3. Step 3: Cross multiply
    1,639.10x = 2,458.02 × 858.50
  4. Step 4: Simplify right side
    1,639.10x = 2,110,210.17
  5. Step 5: Solve for x
    x = 2,110,210.17/1,639.10
  6. Step 6: Final answer
    x = 1,287.42

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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.