Home / 8,655.40-12,981.66-2,811.28

Finding the Fourth Proportional to 8,655.40, 12,981.66 and 2,811.28

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Solution

The fourth proportional to 8,655.40, 12,981.66 and 2,811.28 is: 4,216.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,655.40 : 12,981.66 = 2,811.28 : x
  2. Step 2: Convert to fraction form
    8,655.40/12,981.66 = 2,811.28/x
  3. Step 3: Cross multiply
    8,655.40x = 12,981.66 × 2,811.28
  4. Step 4: Simplify right side
    8,655.40x = 36,495,081.12
  5. Step 5: Solve for x
    x = 36,495,081.12/8,655.40
  6. Step 6: Final answer
    x = 4,216.45

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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.