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Finding the Fourth Proportional to 4,913.64, 7,368 and 1,991.16

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Solution

The fourth proportional to 4,913.64, 7,368 and 1,991.16 is: 2,985.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,913.64 : 7,368 = 1,991.16 : x
  2. Step 2: Convert to fraction form
    4,913.64/7,368 = 1,991.16/x
  3. Step 3: Cross multiply
    4,913.64x = 7,368 × 1,991.16
  4. Step 4: Simplify right side
    4,913.64x = 14,670,866.88
  5. Step 5: Solve for x
    x = 14,670,866.88/4,913.64
  6. Step 6: Final answer
    x = 2,985.74

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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.