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Finding the Fourth Proportional to 1,259.23, 1,887.98 and 641.74

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Solution

The fourth proportional to 1,259.23, 1,887.98 and 641.74 is: 962.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.23 : 1,887.98 = 641.74 : x
  2. Step 2: Convert to fraction form
    1,259.23/1,887.98 = 641.74/x
  3. Step 3: Cross multiply
    1,259.23x = 1,887.98 × 641.74
  4. Step 4: Simplify right side
    1,259.23x = 1,211,592.29
  5. Step 5: Solve for x
    x = 1,211,592.29/1,259.23
  6. Step 6: Final answer
    x = 962.17

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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.