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Finding the Fourth Proportional to 9,955.40, 13,739.78 and 9,114.59

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Solution

The fourth proportional to 9,955.40, 13,739.78 and 9,114.59 is: 12,579.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,955.40 : 13,739.78 = 9,114.59 : x
  2. Step 2: Convert to fraction form
    9,955.40/13,739.78 = 9,114.59/x
  3. Step 3: Cross multiply
    9,955.40x = 13,739.78 × 9,114.59
  4. Step 4: Simplify right side
    9,955.40x = 125,232,347.12
  5. Step 5: Solve for x
    x = 125,232,347.12/9,955.40
  6. Step 6: Final answer
    x = 12,579.34

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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.