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Finding the Fourth Proportional to 1,323.76, 1,985.64 and 553.72

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Solution

The fourth proportional to 1,323.76, 1,985.64 and 553.72 is: 830.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,323.76 : 1,985.64 = 553.72 : x
  2. Step 2: Convert to fraction form
    1,323.76/1,985.64 = 553.72/x
  3. Step 3: Cross multiply
    1,323.76x = 1,985.64 × 553.72
  4. Step 4: Simplify right side
    1,323.76x = 1,099,488.58
  5. Step 5: Solve for x
    x = 1,099,488.58/1,323.76
  6. Step 6: Final answer
    x = 830.58

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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.