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Finding the Fourth Proportional to 686.70, 947.33 and 608.10

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Solution

The fourth proportional to 686.70, 947.33 and 608.10 is: 838.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.70 : 947.33 = 608.10 : x
  2. Step 2: Convert to fraction form
    686.70/947.33 = 608.10/x
  3. Step 3: Cross multiply
    686.70x = 947.33 × 608.10
  4. Step 4: Simplify right side
    686.70x = 576,067.06
  5. Step 5: Solve for x
    x = 576,067.06/686.70
  6. Step 6: Final answer
    x = 838.89

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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.