Home / 12,585.28-18,880.20-5,185.63

Finding the Fourth Proportional to 12,585.28, 18,880.20 and 5,185.63

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Solution

The fourth proportional to 12,585.28, 18,880.20 and 5,185.63 is: 7,779.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,585.28 : 18,880.20 = 5,185.63 : x
  2. Step 2: Convert to fraction form
    12,585.28/18,880.20 = 5,185.63/x
  3. Step 3: Cross multiply
    12,585.28x = 18,880.20 × 5,185.63
  4. Step 4: Simplify right side
    12,585.28x = 97,905,731.53
  5. Step 5: Solve for x
    x = 97,905,731.53/12,585.28
  6. Step 6: Final answer
    x = 7,779.38

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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.