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Finding the Fourth Proportional to 1,580.40, 2,181.06 and 881.64

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Solution

The fourth proportional to 1,580.40, 2,181.06 and 881.64 is: 1,216.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.40 : 2,181.06 = 881.64 : x
  2. Step 2: Convert to fraction form
    1,580.40/2,181.06 = 881.64/x
  3. Step 3: Cross multiply
    1,580.40x = 2,181.06 × 881.64
  4. Step 4: Simplify right side
    1,580.40x = 1,922,909.74
  5. Step 5: Solve for x
    x = 1,922,909.74/1,580.40
  6. Step 6: Final answer
    x = 1,216.72

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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.