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Finding the Fourth Proportional to 9,885.70, 13,642.15 and 5,409.40

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Solution

The fourth proportional to 9,885.70, 13,642.15 and 5,409.40 is: 7,464.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,885.70 : 13,642.15 = 5,409.40 : x
  2. Step 2: Convert to fraction form
    9,885.70/13,642.15 = 5,409.40/x
  3. Step 3: Cross multiply
    9,885.70x = 13,642.15 × 5,409.40
  4. Step 4: Simplify right side
    9,885.70x = 73,795,846.21
  5. Step 5: Solve for x
    x = 73,795,846.21/9,885.70
  6. Step 6: Final answer
    x = 7,464.91

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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.