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Finding the Fourth Proportional to 947.16, 1,419.26 and 621.81

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Solution

The fourth proportional to 947.16, 1,419.26 and 621.81 is: 931.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.16 : 1,419.26 = 621.81 : x
  2. Step 2: Convert to fraction form
    947.16/1,419.26 = 621.81/x
  3. Step 3: Cross multiply
    947.16x = 1,419.26 × 621.81
  4. Step 4: Simplify right side
    947.16x = 882,506.95
  5. Step 5: Solve for x
    x = 882,506.95/947.16
  6. Step 6: Final answer
    x = 931.74

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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.