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Finding the Fourth Proportional to 712.64, 985.32 and 630.56

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Solution

The fourth proportional to 712.64, 985.32 and 630.56 is: 871.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.64 : 985.32 = 630.56 : x
  2. Step 2: Convert to fraction form
    712.64/985.32 = 630.56/x
  3. Step 3: Cross multiply
    712.64x = 985.32 × 630.56
  4. Step 4: Simplify right side
    712.64x = 621,303.38
  5. Step 5: Solve for x
    x = 621,303.38/712.64
  6. Step 6: Final answer
    x = 871.83

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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.