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Finding the Fourth Proportional to 11,457.50, 15,811.35 and 6,489.50

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Solution

The fourth proportional to 11,457.50, 15,811.35 and 6,489.50 is: 8,955.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,457.50 : 15,811.35 = 6,489.50 : x
  2. Step 2: Convert to fraction form
    11,457.50/15,811.35 = 6,489.50/x
  3. Step 3: Cross multiply
    11,457.50x = 15,811.35 × 6,489.50
  4. Step 4: Simplify right side
    11,457.50x = 102,607,755.83
  5. Step 5: Solve for x
    x = 102,607,755.83/11,457.50
  6. Step 6: Final answer
    x = 8,955.51

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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.