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Finding the Fourth Proportional to 969.40, 1,454.10 and 841.40

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Solution

The fourth proportional to 969.40, 1,454.10 and 841.40 is: 1,262.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.40 : 1,454.10 = 841.40 : x
  2. Step 2: Convert to fraction form
    969.40/1,454.10 = 841.40/x
  3. Step 3: Cross multiply
    969.40x = 1,454.10 × 841.40
  4. Step 4: Simplify right side
    969.40x = 1,223,479.74
  5. Step 5: Solve for x
    x = 1,223,479.74/969.40
  6. Step 6: Final answer
    x = 1,262.10

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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.