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Finding the Fourth Proportional to 774.30, 1,066.36 and 705.10

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Solution

The fourth proportional to 774.30, 1,066.36 and 705.10 is: 971.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.30 : 1,066.36 = 705.10 : x
  2. Step 2: Convert to fraction form
    774.30/1,066.36 = 705.10/x
  3. Step 3: Cross multiply
    774.30x = 1,066.36 × 705.10
  4. Step 4: Simplify right side
    774.30x = 751,890.44
  5. Step 5: Solve for x
    x = 751,890.44/774.30
  6. Step 6: Final answer
    x = 971.06

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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.