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Finding the Fourth Proportional to 13,630.61, 18,809.31 and 7,663.21

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Solution

The fourth proportional to 13,630.61, 18,809.31 and 7,663.21 is: 10,574.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,630.61 : 18,809.31 = 7,663.21 : x
  2. Step 2: Convert to fraction form
    13,630.61/18,809.31 = 7,663.21/x
  3. Step 3: Cross multiply
    13,630.61x = 18,809.31 × 7,663.21
  4. Step 4: Simplify right side
    13,630.61x = 144,139,674.20
  5. Step 5: Solve for x
    x = 144,139,674.20/13,630.61
  6. Step 6: Final answer
    x = 10,574.70

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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.