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Finding the Fourth Proportional to 774.40, 1,007.80 and 774.40

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Solution

The fourth proportional to 774.40, 1,007.80 and 774.40 is: 1,007.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.40 : 1,007.80 = 774.40 : x
  2. Step 2: Convert to fraction form
    774.40/1,007.80 = 774.40/x
  3. Step 3: Cross multiply
    774.40x = 1,007.80 × 774.40
  4. Step 4: Simplify right side
    774.40x = 780,440.32
  5. Step 5: Solve for x
    x = 780,440.32/774.40
  6. Step 6: Final answer
    x = 1,007.80

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.