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Finding the Fourth Proportional to 775.02, 1,069.35 and 491.16

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Solution

The fourth proportional to 775.02, 1,069.35 and 491.16 is: 677.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.02 : 1,069.35 = 491.16 : x
  2. Step 2: Convert to fraction form
    775.02/1,069.35 = 491.16/x
  3. Step 3: Cross multiply
    775.02x = 1,069.35 × 491.16
  4. Step 4: Simplify right side
    775.02x = 525,226.88
  5. Step 5: Solve for x
    x = 525,226.88/775.02
  6. Step 6: Final answer
    x = 677.70

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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.