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Finding the Fourth Proportional to 1,259.61, 1,887.76 and 642.79

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Solution

The fourth proportional to 1,259.61, 1,887.76 and 642.79 is: 963.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.61 : 1,887.76 = 642.79 : x
  2. Step 2: Convert to fraction form
    1,259.61/1,887.76 = 642.79/x
  3. Step 3: Cross multiply
    1,259.61x = 1,887.76 × 642.79
  4. Step 4: Simplify right side
    1,259.61x = 1,213,433.25
  5. Step 5: Solve for x
    x = 1,213,433.25/1,259.61
  6. Step 6: Final answer
    x = 963.34

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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.