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Finding the Fourth Proportional to 1,356.64, 1,871.80 and 884.64

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Solution

The fourth proportional to 1,356.64, 1,871.80 and 884.64 is: 1,220.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.64 : 1,871.80 = 884.64 : x
  2. Step 2: Convert to fraction form
    1,356.64/1,871.80 = 884.64/x
  3. Step 3: Cross multiply
    1,356.64x = 1,871.80 × 884.64
  4. Step 4: Simplify right side
    1,356.64x = 1,655,869.15
  5. Step 5: Solve for x
    x = 1,655,869.15/1,356.64
  6. Step 6: Final answer
    x = 1,220.57

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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.