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Finding the Fourth Proportional to 13,989.78, 19,301.54 and 7,939.02

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Solution

The fourth proportional to 13,989.78, 19,301.54 and 7,939.02 is: 10,953.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,989.78 : 19,301.54 = 7,939.02 : x
  2. Step 2: Convert to fraction form
    13,989.78/19,301.54 = 7,939.02/x
  3. Step 3: Cross multiply
    13,989.78x = 19,301.54 × 7,939.02
  4. Step 4: Simplify right side
    13,989.78x = 153,235,312.09
  5. Step 5: Solve for x
    x = 153,235,312.09/13,989.78
  6. Step 6: Final answer
    x = 10,953.38

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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.