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Finding the Fourth Proportional to 775.66, 1,069.76 and 657.94

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Solution

The fourth proportional to 775.66, 1,069.76 and 657.94 is: 907.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.66 : 1,069.76 = 657.94 : x
  2. Step 2: Convert to fraction form
    775.66/1,069.76 = 657.94/x
  3. Step 3: Cross multiply
    775.66x = 1,069.76 × 657.94
  4. Step 4: Simplify right side
    775.66x = 703,829.26
  5. Step 5: Solve for x
    x = 703,829.26/775.66
  6. Step 6: Final answer
    x = 907.40

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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.