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Finding the Fourth Proportional to 686.56, 947.56 and 454.08

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Solution

The fourth proportional to 686.56, 947.56 and 454.08 is: 626.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.56 : 947.56 = 454.08 : x
  2. Step 2: Convert to fraction form
    686.56/947.56 = 454.08/x
  3. Step 3: Cross multiply
    686.56x = 947.56 × 454.08
  4. Step 4: Simplify right side
    686.56x = 430,268.04
  5. Step 5: Solve for x
    x = 430,268.04/686.56
  6. Step 6: Final answer
    x = 626.70

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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.