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Finding the Fourth Proportional to 13,490.88, 18,626.60 and 8,457.20

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Solution

The fourth proportional to 13,490.88, 18,626.60 and 8,457.20 is: 11,676.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,490.88 : 18,626.60 = 8,457.20 : x
  2. Step 2: Convert to fraction form
    13,490.88/18,626.60 = 8,457.20/x
  3. Step 3: Cross multiply
    13,490.88x = 18,626.60 × 8,457.20
  4. Step 4: Simplify right side
    13,490.88x = 157,528,881.52
  5. Step 5: Solve for x
    x = 157,528,881.52/13,490.88
  6. Step 6: Final answer
    x = 11,676.69

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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.