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Finding the Fourth Proportional to 935.24, 1,291.06 and 686.56

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Solution

The fourth proportional to 935.24, 1,291.06 and 686.56 is: 947.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.24 : 1,291.06 = 686.56 : x
  2. Step 2: Convert to fraction form
    935.24/1,291.06 = 686.56/x
  3. Step 3: Cross multiply
    935.24x = 1,291.06 × 686.56
  4. Step 4: Simplify right side
    935.24x = 886,390.15
  5. Step 5: Solve for x
    x = 886,390.15/935.24
  6. Step 6: Final answer
    x = 947.77

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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.