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Finding the Fourth Proportional to 13,705.20, 18,913.20 and 7,417.58

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Solution

The fourth proportional to 13,705.20, 18,913.20 and 7,417.58 is: 10,236.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,705.20 : 18,913.20 = 7,417.58 : x
  2. Step 2: Convert to fraction form
    13,705.20/18,913.20 = 7,417.58/x
  3. Step 3: Cross multiply
    13,705.20x = 18,913.20 × 7,417.58
  4. Step 4: Simplify right side
    13,705.20x = 140,290,042.40
  5. Step 5: Solve for x
    x = 140,290,042.40/13,705.20
  6. Step 6: Final answer
    x = 10,236.26

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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.