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Finding the Fourth Proportional to 674.60, 931.46 and 478.76

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Solution

The fourth proportional to 674.60, 931.46 and 478.76 is: 661.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.60 : 931.46 = 478.76 : x
  2. Step 2: Convert to fraction form
    674.60/931.46 = 478.76/x
  3. Step 3: Cross multiply
    674.60x = 931.46 × 478.76
  4. Step 4: Simplify right side
    674.60x = 445,945.79
  5. Step 5: Solve for x
    x = 445,945.79/674.60
  6. Step 6: Final answer
    x = 661.05

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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.