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Finding the Fourth Proportional to 9,385.88, 12,955.40 and 5,409.64

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Solution

The fourth proportional to 9,385.88, 12,955.40 and 5,409.64 is: 7,466.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,385.88 : 12,955.40 = 5,409.64 : x
  2. Step 2: Convert to fraction form
    9,385.88/12,955.40 = 5,409.64/x
  3. Step 3: Cross multiply
    9,385.88x = 12,955.40 × 5,409.64
  4. Step 4: Simplify right side
    9,385.88x = 70,083,990.62
  5. Step 5: Solve for x
    x = 70,083,990.62/9,385.88
  6. Step 6: Final answer
    x = 7,466.96

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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.