Home / 10,129.78-13,984.95-7,720.84

Finding the Fourth Proportional to 10,129.78, 13,984.95 and 7,720.84

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Solution

The fourth proportional to 10,129.78, 13,984.95 and 7,720.84 is: 10,659.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,129.78 : 13,984.95 = 7,720.84 : x
  2. Step 2: Convert to fraction form
    10,129.78/13,984.95 = 7,720.84/x
  3. Step 3: Cross multiply
    10,129.78x = 13,984.95 × 7,720.84
  4. Step 4: Simplify right side
    10,129.78x = 107,975,561.36
  5. Step 5: Solve for x
    x = 107,975,561.36/10,129.78
  6. Step 6: Final answer
    x = 10,659.22

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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.