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Finding the Fourth Proportional to 632.70, 947.70 and 389.70

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Solution

The fourth proportional to 632.70, 947.70 and 389.70 is: 583.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.70 : 947.70 = 389.70 : x
  2. Step 2: Convert to fraction form
    632.70/947.70 = 389.70/x
  3. Step 3: Cross multiply
    632.70x = 947.70 × 389.70
  4. Step 4: Simplify right side
    632.70x = 369,318.69
  5. Step 5: Solve for x
    x = 369,318.69/632.70
  6. Step 6: Final answer
    x = 583.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.