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Finding the Fourth Proportional to 1,091.74, 1,506.70 and 672.20

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Solution

The fourth proportional to 1,091.74, 1,506.70 and 672.20 is: 927.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.74 : 1,506.70 = 672.20 : x
  2. Step 2: Convert to fraction form
    1,091.74/1,506.70 = 672.20/x
  3. Step 3: Cross multiply
    1,091.74x = 1,506.70 × 672.20
  4. Step 4: Simplify right side
    1,091.74x = 1,012,803.74
  5. Step 5: Solve for x
    x = 1,012,803.74/1,091.74
  6. Step 6: Final answer
    x = 927.70

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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.