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Finding the Fourth Proportional to 775.57, 1,069.50 and 711.53

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Solution

The fourth proportional to 775.57, 1,069.50 and 711.53 is: 981.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.57 : 1,069.50 = 711.53 : x
  2. Step 2: Convert to fraction form
    775.57/1,069.50 = 711.53/x
  3. Step 3: Cross multiply
    775.57x = 1,069.50 × 711.53
  4. Step 4: Simplify right side
    775.57x = 760,988.68
  5. Step 5: Solve for x
    x = 760,988.68/775.57
  6. Step 6: Final answer
    x = 981.20

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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.