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Finding the Fourth Proportional to 1,259.19, 1,889.40 and 842.99

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Solution

The fourth proportional to 1,259.19, 1,889.40 and 842.99 is: 1,264.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.19 : 1,889.40 = 842.99 : x
  2. Step 2: Convert to fraction form
    1,259.19/1,889.40 = 842.99/x
  3. Step 3: Cross multiply
    1,259.19x = 1,889.40 × 842.99
  4. Step 4: Simplify right side
    1,259.19x = 1,592,735.86
  5. Step 5: Solve for x
    x = 1,592,735.86/1,259.19
  6. Step 6: Final answer
    x = 1,264.89

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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.