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Finding the Fourth Proportional to 686.66, 947.22 and 465.72

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Solution

The fourth proportional to 686.66, 947.22 and 465.72 is: 642.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.66 : 947.22 = 465.72 : x
  2. Step 2: Convert to fraction form
    686.66/947.22 = 465.72/x
  3. Step 3: Cross multiply
    686.66x = 947.22 × 465.72
  4. Step 4: Simplify right side
    686.66x = 441,139.30
  5. Step 5: Solve for x
    x = 441,139.30/686.66
  6. Step 6: Final answer
    x = 642.44

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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.