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Finding the Fourth Proportional to 1,259.46, 1,887.80 and 478.71

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Solution

The fourth proportional to 1,259.46, 1,887.80 and 478.71 is: 717.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.46 : 1,887.80 = 478.71 : x
  2. Step 2: Convert to fraction form
    1,259.46/1,887.80 = 478.71/x
  3. Step 3: Cross multiply
    1,259.46x = 1,887.80 × 478.71
  4. Step 4: Simplify right side
    1,259.46x = 903,706.34
  5. Step 5: Solve for x
    x = 903,706.34/1,259.46
  6. Step 6: Final answer
    x = 717.53

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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.