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Finding the Fourth Proportional to 5,277.08, 7,916.80 and 1,990.20

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Solution

The fourth proportional to 5,277.08, 7,916.80 and 1,990.20 is: 2,985.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,277.08 : 7,916.80 = 1,990.20 : x
  2. Step 2: Convert to fraction form
    5,277.08/7,916.80 = 1,990.20/x
  3. Step 3: Cross multiply
    5,277.08x = 7,916.80 × 1,990.20
  4. Step 4: Simplify right side
    5,277.08x = 15,756,015.36
  5. Step 5: Solve for x
    x = 15,756,015.36/5,277.08
  6. Step 6: Final answer
    x = 2,985.75

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1.5x scale

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.