Home / 1,211.02-1,671.24-687.13

Finding the Fourth Proportional to 1,211.02, 1,671.24 and 687.13

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Solution

The fourth proportional to 1,211.02, 1,671.24 and 687.13 is: 948.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.02 : 1,671.24 = 687.13 : x
  2. Step 2: Convert to fraction form
    1,211.02/1,671.24 = 687.13/x
  3. Step 3: Cross multiply
    1,211.02x = 1,671.24 × 687.13
  4. Step 4: Simplify right side
    1,211.02x = 1,148,359.14
  5. Step 5: Solve for x
    x = 1,148,359.14/1,211.02
  6. Step 6: Final answer
    x = 948.26

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Half scale
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Double scale
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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.