Home / 15,315.20-21,135-8,946.16

Finding the Fourth Proportional to 15,315.20, 21,135 and 8,946.16

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Solution

The fourth proportional to 15,315.20, 21,135 and 8,946.16 is: 12,345.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,315.20 : 21,135 = 8,946.16 : x
  2. Step 2: Convert to fraction form
    15,315.20/21,135 = 8,946.16/x
  3. Step 3: Cross multiply
    15,315.20x = 21,135 × 8,946.16
  4. Step 4: Simplify right side
    15,315.20x = 189,077,091.60
  5. Step 5: Solve for x
    x = 189,077,091.60/15,315.20
  6. Step 6: Final answer
    x = 12,345.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.