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Finding the Fourth Proportional to 9,621.20, 14,431.80 and 8,901.20

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Solution

The fourth proportional to 9,621.20, 14,431.80 and 8,901.20 is: 13,351.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,621.20 : 14,431.80 = 8,901.20 : x
  2. Step 2: Convert to fraction form
    9,621.20/14,431.80 = 8,901.20/x
  3. Step 3: Cross multiply
    9,621.20x = 14,431.80 × 8,901.20
  4. Step 4: Simplify right side
    9,621.20x = 128,460,338.16
  5. Step 5: Solve for x
    x = 128,460,338.16/9,621.20
  6. Step 6: Final answer
    x = 13,351.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.