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Finding the Fourth Proportional to 947.70, 1,312.20 and 826.20

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Solution

The fourth proportional to 947.70, 1,312.20 and 826.20 is: 1,143.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.70 : 1,312.20 = 826.20 : x
  2. Step 2: Convert to fraction form
    947.70/1,312.20 = 826.20/x
  3. Step 3: Cross multiply
    947.70x = 1,312.20 × 826.20
  4. Step 4: Simplify right side
    947.70x = 1,084,139.64
  5. Step 5: Solve for x
    x = 1,084,139.64/947.70
  6. Step 6: Final answer
    x = 1,143.97

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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.