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Finding the Fourth Proportional to 15,797.57, 21,790.91 and 9,420.08

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Solution

The fourth proportional to 15,797.57, 21,790.91 and 9,420.08 is: 12,993.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,797.57 : 21,790.91 = 9,420.08 : x
  2. Step 2: Convert to fraction form
    15,797.57/21,790.91 = 9,420.08/x
  3. Step 3: Cross multiply
    15,797.57x = 21,790.91 × 9,420.08
  4. Step 4: Simplify right side
    15,797.57x = 205,272,030.07
  5. Step 5: Solve for x
    x = 205,272,030.07/15,797.57
  6. Step 6: Final answer
    x = 12,993.90

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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.