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Finding the Fourth Proportional to 969.39, 1,337.99 and 619.47

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Solution

The fourth proportional to 969.39, 1,337.99 and 619.47 is: 855.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.39 : 1,337.99 = 619.47 : x
  2. Step 2: Convert to fraction form
    969.39/1,337.99 = 619.47/x
  3. Step 3: Cross multiply
    969.39x = 1,337.99 × 619.47
  4. Step 4: Simplify right side
    969.39x = 828,841.57
  5. Step 5: Solve for x
    x = 828,841.57/969.39
  6. Step 6: Final answer
    x = 855.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.