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Finding the Fourth Proportional to 13,705.13, 18,913.10 and 8,116.13

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Solution

The fourth proportional to 13,705.13, 18,913.10 and 8,116.13 is: 11,200.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,705.13 : 18,913.10 = 8,116.13 : x
  2. Step 2: Convert to fraction form
    13,705.13/18,913.10 = 8,116.13/x
  3. Step 3: Cross multiply
    13,705.13x = 18,913.10 × 8,116.13
  4. Step 4: Simplify right side
    13,705.13x = 153,501,043.16
  5. Step 5: Solve for x
    x = 153,501,043.16/13,705.13
  6. Step 6: Final answer
    x = 11,200.27

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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.