Home / 1,293.12-1,785.60-921.24

Finding the Fourth Proportional to 1,293.12, 1,785.60 and 921.24

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Solution

The fourth proportional to 1,293.12, 1,785.60 and 921.24 is: 1,272.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.12 : 1,785.60 = 921.24 : x
  2. Step 2: Convert to fraction form
    1,293.12/1,785.60 = 921.24/x
  3. Step 3: Cross multiply
    1,293.12x = 1,785.60 × 921.24
  4. Step 4: Simplify right side
    1,293.12x = 1,644,966.14
  5. Step 5: Solve for x
    x = 1,644,966.14/1,293.12
  6. Step 6: Final answer
    x = 1,272.09

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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.