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Finding the Fourth Proportional to 631.70, 871.70 and 369.86

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Solution

The fourth proportional to 631.70, 871.70 and 369.86 is: 510.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.70 : 871.70 = 369.86 : x
  2. Step 2: Convert to fraction form
    631.70/871.70 = 369.86/x
  3. Step 3: Cross multiply
    631.70x = 871.70 × 369.86
  4. Step 4: Simplify right side
    631.70x = 322,406.96
  5. Step 5: Solve for x
    x = 322,406.96/631.70
  6. Step 6: Final answer
    x = 510.38

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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.