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Finding the Fourth Proportional to 779.44, 1,073.16 and 686.12

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Solution

The fourth proportional to 779.44, 1,073.16 and 686.12 is: 944.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.44 : 1,073.16 = 686.12 : x
  2. Step 2: Convert to fraction form
    779.44/1,073.16 = 686.12/x
  3. Step 3: Cross multiply
    779.44x = 1,073.16 × 686.12
  4. Step 4: Simplify right side
    779.44x = 736,316.54
  5. Step 5: Solve for x
    x = 736,316.54/779.44
  6. Step 6: Final answer
    x = 944.67

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Double scale
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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.