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Finding the Fourth Proportional to 3,518.06, 5,277.40 and 921

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Solution

The fourth proportional to 3,518.06, 5,277.40 and 921 is: 1,381.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,518.06 : 5,277.40 = 921 : x
  2. Step 2: Convert to fraction form
    3,518.06/5,277.40 = 921/x
  3. Step 3: Cross multiply
    3,518.06x = 5,277.40 × 921
  4. Step 4: Simplify right side
    3,518.06x = 4,860,483.10
  5. Step 5: Solve for x
    x = 4,860,483.10/3,518.06
  6. Step 6: Final answer
    x = 1,381.58

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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.