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Finding the Fourth Proportional to 1,611.56, 2,415.72 and 788.60

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Solution

The fourth proportional to 1,611.56, 2,415.72 and 788.60 is: 1,182.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.56 : 2,415.72 = 788.60 : x
  2. Step 2: Convert to fraction form
    1,611.56/2,415.72 = 788.60/x
  3. Step 3: Cross multiply
    1,611.56x = 2,415.72 × 788.60
  4. Step 4: Simplify right side
    1,611.56x = 1,905,036.79
  5. Step 5: Solve for x
    x = 1,905,036.79/1,611.56
  6. Step 6: Final answer
    x = 1,182.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.