Home / 12,135.84-18,210.30-5,120.72

Finding the Fourth Proportional to 12,135.84, 18,210.30 and 5,120.72

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Solution

The fourth proportional to 12,135.84, 18,210.30 and 5,120.72 is: 7,683.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.84 : 18,210.30 = 5,120.72 : x
  2. Step 2: Convert to fraction form
    12,135.84/18,210.30 = 5,120.72/x
  3. Step 3: Cross multiply
    12,135.84x = 18,210.30 × 5,120.72
  4. Step 4: Simplify right side
    12,135.84x = 93,249,756.36
  5. Step 5: Solve for x
    x = 93,249,756.36/12,135.84
  6. Step 6: Final answer
    x = 7,683.83

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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.