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Finding the Fourth Proportional to 1,617.47, 2,231.91 and 909.35

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Solution

The fourth proportional to 1,617.47, 2,231.91 and 909.35 is: 1,254.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,617.47 : 2,231.91 = 909.35 : x
  2. Step 2: Convert to fraction form
    1,617.47/2,231.91 = 909.35/x
  3. Step 3: Cross multiply
    1,617.47x = 2,231.91 × 909.35
  4. Step 4: Simplify right side
    1,617.47x = 2,029,587.36
  5. Step 5: Solve for x
    x = 2,029,587.36/1,617.47
  6. Step 6: Final answer
    x = 1,254.79

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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.