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Finding the Fourth Proportional to 743.14, 1,113.99 and 621.64

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Solution

The fourth proportional to 743.14, 1,113.99 and 621.64 is: 931.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.14 : 1,113.99 = 621.64 : x
  2. Step 2: Convert to fraction form
    743.14/1,113.99 = 621.64/x
  3. Step 3: Cross multiply
    743.14x = 1,113.99 × 621.64
  4. Step 4: Simplify right side
    743.14x = 692,500.74
  5. Step 5: Solve for x
    x = 692,500.74/743.14
  6. Step 6: Final answer
    x = 931.86

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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.