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Finding the Fourth Proportional to 1,415.82, 1,953.65 and 891.75

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Solution

The fourth proportional to 1,415.82, 1,953.65 and 891.75 is: 1,230.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.82 : 1,953.65 = 891.75 : x
  2. Step 2: Convert to fraction form
    1,415.82/1,953.65 = 891.75/x
  3. Step 3: Cross multiply
    1,415.82x = 1,953.65 × 891.75
  4. Step 4: Simplify right side
    1,415.82x = 1,742,162.93
  5. Step 5: Solve for x
    x = 1,742,162.93/1,415.82
  6. Step 6: Final answer
    x = 1,230.50

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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.