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Finding the Fourth Proportional to 1,259.23, 1,889.04 and 642.70

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Solution

The fourth proportional to 1,259.23, 1,889.04 and 642.70 is: 964.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.23 : 1,889.04 = 642.70 : x
  2. Step 2: Convert to fraction form
    1,259.23/1,889.04 = 642.70/x
  3. Step 3: Cross multiply
    1,259.23x = 1,889.04 × 642.70
  4. Step 4: Simplify right side
    1,259.23x = 1,214,086.01
  5. Step 5: Solve for x
    x = 1,214,086.01/1,259.23
  6. Step 6: Final answer
    x = 964.15

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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.