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Finding the Fourth Proportional to 1,415.40, 1,953.78 and 891.80

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Solution

The fourth proportional to 1,415.40, 1,953.78 and 891.80 is: 1,231.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.40 : 1,953.78 = 891.80 : x
  2. Step 2: Convert to fraction form
    1,415.40/1,953.78 = 891.80/x
  3. Step 3: Cross multiply
    1,415.40x = 1,953.78 × 891.80
  4. Step 4: Simplify right side
    1,415.40x = 1,742,381.00
  5. Step 5: Solve for x
    x = 1,742,381.00/1,415.40
  6. Step 6: Final answer
    x = 1,231.02

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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.