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Finding the Fourth Proportional to 702.20, 1,053.30 and 623.90

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Solution

The fourth proportional to 702.20, 1,053.30 and 623.90 is: 935.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.20 : 1,053.30 = 623.90 : x
  2. Step 2: Convert to fraction form
    702.20/1,053.30 = 623.90/x
  3. Step 3: Cross multiply
    702.20x = 1,053.30 × 623.90
  4. Step 4: Simplify right side
    702.20x = 657,153.87
  5. Step 5: Solve for x
    x = 657,153.87/702.20
  6. Step 6: Final answer
    x = 935.85

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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.