Home / 13,688.61-18,890.19-7,720.33

Finding the Fourth Proportional to 13,688.61, 18,890.19 and 7,720.33

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Solution

The fourth proportional to 13,688.61, 18,890.19 and 7,720.33 is: 10,654.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.61 : 18,890.19 = 7,720.33 : x
  2. Step 2: Convert to fraction form
    13,688.61/18,890.19 = 7,720.33/x
  3. Step 3: Cross multiply
    13,688.61x = 18,890.19 × 7,720.33
  4. Step 4: Simplify right side
    13,688.61x = 145,838,500.56
  5. Step 5: Solve for x
    x = 145,838,500.56/13,688.61
  6. Step 6: Final answer
    x = 10,654.00

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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.