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Finding the Fourth Proportional to 881.68, 1,323.60 and 558.40

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Solution

The fourth proportional to 881.68, 1,323.60 and 558.40 is: 838.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.68 : 1,323.60 = 558.40 : x
  2. Step 2: Convert to fraction form
    881.68/1,323.60 = 558.40/x
  3. Step 3: Cross multiply
    881.68x = 1,323.60 × 558.40
  4. Step 4: Simplify right side
    881.68x = 739,098.24
  5. Step 5: Solve for x
    x = 739,098.24/881.68
  6. Step 6: Final answer
    x = 838.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.