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Finding the Fourth Proportional to 1,240.08, 1,712.07 and 742.91

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Solution

The fourth proportional to 1,240.08, 1,712.07 and 742.91 is: 1,025.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.08 : 1,712.07 = 742.91 : x
  2. Step 2: Convert to fraction form
    1,240.08/1,712.07 = 742.91/x
  3. Step 3: Cross multiply
    1,240.08x = 1,712.07 × 742.91
  4. Step 4: Simplify right side
    1,240.08x = 1,271,905.36
  5. Step 5: Solve for x
    x = 1,271,905.36/1,240.08
  6. Step 6: Final answer
    x = 1,025.66

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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.