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Finding the Fourth Proportional to 1,415.58, 1,953.09 and 891.78

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Solution

The fourth proportional to 1,415.58, 1,953.09 and 891.78 is: 1,230.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.58 : 1,953.09 = 891.78 : x
  2. Step 2: Convert to fraction form
    1,415.58/1,953.09 = 891.78/x
  3. Step 3: Cross multiply
    1,415.58x = 1,953.09 × 891.78
  4. Step 4: Simplify right side
    1,415.58x = 1,741,726.60
  5. Step 5: Solve for x
    x = 1,741,726.60/1,415.58
  6. Step 6: Final answer
    x = 1,230.40

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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.