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Finding the Fourth Proportional to 9,891.80, 14,837.70 and 5,205.40

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Solution

The fourth proportional to 9,891.80, 14,837.70 and 5,205.40 is: 7,808.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,891.80 : 14,837.70 = 5,205.40 : x
  2. Step 2: Convert to fraction form
    9,891.80/14,837.70 = 5,205.40/x
  3. Step 3: Cross multiply
    9,891.80x = 14,837.70 × 5,205.40
  4. Step 4: Simplify right side
    9,891.80x = 77,236,163.58
  5. Step 5: Solve for x
    x = 77,236,163.58/9,891.80
  6. Step 6: Final answer
    x = 7,808.10

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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.