Home / 20,856.15-28,790.81-13,312.47

Finding the Fourth Proportional to 20,856.15, 28,790.81 and 13,312.47

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Solution

The fourth proportional to 20,856.15, 28,790.81 and 13,312.47 is: 18,377.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.15 : 28,790.81 = 13,312.47 : x
  2. Step 2: Convert to fraction form
    20,856.15/28,790.81 = 13,312.47/x
  3. Step 3: Cross multiply
    20,856.15x = 28,790.81 × 13,312.47
  4. Step 4: Simplify right side
    20,856.15x = 383,276,727.84
  5. Step 5: Solve for x
    x = 383,276,727.84/20,856.15
  6. Step 6: Final answer
    x = 18,377.16

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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.