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Finding the Fourth Proportional to 788.80, 1,180.80 and 702.40

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Solution

The fourth proportional to 788.80, 1,180.80 and 702.40 is: 1,051.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.80 : 1,180.80 = 702.40 : x
  2. Step 2: Convert to fraction form
    788.80/1,180.80 = 702.40/x
  3. Step 3: Cross multiply
    788.80x = 1,180.80 × 702.40
  4. Step 4: Simplify right side
    788.80x = 829,393.92
  5. Step 5: Solve for x
    x = 829,393.92/788.80
  6. Step 6: Final answer
    x = 1,051.46

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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.