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Finding the Fourth Proportional to 774.48, 1,069.80 and 696.72

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Solution

The fourth proportional to 774.48, 1,069.80 and 696.72 is: 962.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.48 : 1,069.80 = 696.72 : x
  2. Step 2: Convert to fraction form
    774.48/1,069.80 = 696.72/x
  3. Step 3: Cross multiply
    774.48x = 1,069.80 × 696.72
  4. Step 4: Simplify right side
    774.48x = 745,351.06
  5. Step 5: Solve for x
    x = 745,351.06/774.48
  6. Step 6: Final answer
    x = 962.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.