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Finding the Fourth Proportional to 947, 1,420.60 and 253.68

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Solution

The fourth proportional to 947, 1,420.60 and 253.68 is: 380.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    947 : 1,420.60 = 253.68 : x
  2. Step 2: Convert to fraction form
    947/1,420.60 = 253.68/x
  3. Step 3: Cross multiply
    947x = 1,420.60 × 253.68
  4. Step 4: Simplify right side
    947x = 360,377.81
  5. Step 5: Solve for x
    x = 360,377.81/947
  6. Step 6: Final answer
    x = 380.55

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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.