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Finding the Fourth Proportional to 1,152.88, 1,591.80 and 821.64

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Solution

The fourth proportional to 1,152.88, 1,591.80 and 821.64 is: 1,134.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.88 : 1,591.80 = 821.64 : x
  2. Step 2: Convert to fraction form
    1,152.88/1,591.80 = 821.64/x
  3. Step 3: Cross multiply
    1,152.88x = 1,591.80 × 821.64
  4. Step 4: Simplify right side
    1,152.88x = 1,307,894.06
  5. Step 5: Solve for x
    x = 1,307,894.06/1,152.88
  6. Step 6: Final answer
    x = 1,134.46

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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.