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Finding the Fourth Proportional to 702.99, 1,054.80 and 378.41

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Solution

The fourth proportional to 702.99, 1,054.80 and 378.41 is: 567.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.99 : 1,054.80 = 378.41 : x
  2. Step 2: Convert to fraction form
    702.99/1,054.80 = 378.41/x
  3. Step 3: Cross multiply
    702.99x = 1,054.80 × 378.41
  4. Step 4: Simplify right side
    702.99x = 399,141.59
  5. Step 5: Solve for x
    x = 399,141.59/702.99
  6. Step 6: Final answer
    x = 567.78

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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.