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Finding the Fourth Proportional to 1,390.17, 1,918.61 and 892.63

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Solution

The fourth proportional to 1,390.17, 1,918.61 and 892.63 is: 1,231.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.17 : 1,918.61 = 892.63 : x
  2. Step 2: Convert to fraction form
    1,390.17/1,918.61 = 892.63/x
  3. Step 3: Cross multiply
    1,390.17x = 1,918.61 × 892.63
  4. Step 4: Simplify right side
    1,390.17x = 1,712,608.84
  5. Step 5: Solve for x
    x = 1,712,608.84/1,390.17
  6. Step 6: Final answer
    x = 1,231.94

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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.