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Finding the Fourth Proportional to 1,293.60, 1,940.70 and 471.78

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Solution

The fourth proportional to 1,293.60, 1,940.70 and 471.78 is: 707.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.60 : 1,940.70 = 471.78 : x
  2. Step 2: Convert to fraction form
    1,293.60/1,940.70 = 471.78/x
  3. Step 3: Cross multiply
    1,293.60x = 1,940.70 × 471.78
  4. Step 4: Simplify right side
    1,293.60x = 915,583.45
  5. Step 5: Solve for x
    x = 915,583.45/1,293.60
  6. Step 6: Final answer
    x = 707.78

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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.