Home / 15,515.96-21,411.13-8,709.35

Finding the Fourth Proportional to 15,515.96, 21,411.13 and 8,709.35

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Solution

The fourth proportional to 15,515.96, 21,411.13 and 8,709.35 is: 12,018.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,515.96 : 21,411.13 = 8,709.35 : x
  2. Step 2: Convert to fraction form
    15,515.96/21,411.13 = 8,709.35/x
  3. Step 3: Cross multiply
    15,515.96x = 21,411.13 × 8,709.35
  4. Step 4: Simplify right side
    15,515.96x = 186,477,025.07
  5. Step 5: Solve for x
    x = 186,477,025.07/15,515.96
  6. Step 6: Final answer
    x = 12,018.40

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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.