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Finding the Fourth Proportional to 1,206.91, 1,666.90 and 813.25

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Solution

The fourth proportional to 1,206.91, 1,666.90 and 813.25 is: 1,123.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.91 : 1,666.90 = 813.25 : x
  2. Step 2: Convert to fraction form
    1,206.91/1,666.90 = 813.25/x
  3. Step 3: Cross multiply
    1,206.91x = 1,666.90 × 813.25
  4. Step 4: Simplify right side
    1,206.91x = 1,355,598.09
  5. Step 5: Solve for x
    x = 1,355,598.09/1,206.91
  6. Step 6: Final answer
    x = 1,123.20

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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.