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Finding the Fourth Proportional to 974.74, 1,461.14 and 389.39

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Solution

The fourth proportional to 974.74, 1,461.14 and 389.39 is: 583.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.74 : 1,461.14 = 389.39 : x
  2. Step 2: Convert to fraction form
    974.74/1,461.14 = 389.39/x
  3. Step 3: Cross multiply
    974.74x = 1,461.14 × 389.39
  4. Step 4: Simplify right side
    974.74x = 568,955.92
  5. Step 5: Solve for x
    x = 568,955.92/974.74
  6. Step 6: Final answer
    x = 583.70

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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.