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Finding the Fourth Proportional to 1,206.80, 1,664.89 and 957.13

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Solution

The fourth proportional to 1,206.80, 1,664.89 and 957.13 is: 1,320.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.80 : 1,664.89 = 957.13 : x
  2. Step 2: Convert to fraction form
    1,206.80/1,664.89 = 957.13/x
  3. Step 3: Cross multiply
    1,206.80x = 1,664.89 × 957.13
  4. Step 4: Simplify right side
    1,206.80x = 1,593,516.17
  5. Step 5: Solve for x
    x = 1,593,516.17/1,206.80
  6. Step 6: Final answer
    x = 1,320.45

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1.5x scale

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.