Home / 12,585.41-18,880.40-5,185.76

Finding the Fourth Proportional to 12,585.41, 18,880.40 and 5,185.76

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Solution

The fourth proportional to 12,585.41, 18,880.40 and 5,185.76 is: 7,779.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,585.41 : 18,880.40 = 5,185.76 : x
  2. Step 2: Convert to fraction form
    12,585.41/18,880.40 = 5,185.76/x
  3. Step 3: Cross multiply
    12,585.41x = 18,880.40 × 5,185.76
  4. Step 4: Simplify right side
    12,585.41x = 97,909,102.77
  5. Step 5: Solve for x
    x = 97,909,102.77/12,585.41
  6. Step 6: Final answer
    x = 7,779.57

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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.