Home / 13,688.79-18,890.52-7,720.44

Finding the Fourth Proportional to 13,688.79, 18,890.52 and 7,720.44

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Solution

The fourth proportional to 13,688.79, 18,890.52 and 7,720.44 is: 10,654.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,688.79 : 18,890.52 = 7,720.44 : x
  2. Step 2: Convert to fraction form
    13,688.79/18,890.52 = 7,720.44/x
  3. Step 3: Cross multiply
    13,688.79x = 18,890.52 × 7,720.44
  4. Step 4: Simplify right side
    13,688.79x = 145,843,192.76
  5. Step 5: Solve for x
    x = 145,843,192.76/13,688.79
  6. Step 6: Final answer
    x = 10,654.21

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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.