Home / 1,291.32-1,784.30-1,031.48

Finding the Fourth Proportional to 1,291.32, 1,784.30 and 1,031.48

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Solution

The fourth proportional to 1,291.32, 1,784.30 and 1,031.48 is: 1,425.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.32 : 1,784.30 = 1,031.48 : x
  2. Step 2: Convert to fraction form
    1,291.32/1,784.30 = 1,031.48/x
  3. Step 3: Cross multiply
    1,291.32x = 1,784.30 × 1,031.48
  4. Step 4: Simplify right side
    1,291.32x = 1,840,469.76
  5. Step 5: Solve for x
    x = 1,840,469.76/1,291.32
  6. Step 6: Final answer
    x = 1,425.26

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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.