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Finding the Fourth Proportional to 15,790.64, 21,790.28 and 9,075.60

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Solution

The fourth proportional to 15,790.64, 21,790.28 and 9,075.60 is: 12,523.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,790.64 : 21,790.28 = 9,075.60 : x
  2. Step 2: Convert to fraction form
    15,790.64/21,790.28 = 9,075.60/x
  3. Step 3: Cross multiply
    15,790.64x = 21,790.28 × 9,075.60
  4. Step 4: Simplify right side
    15,790.64x = 197,759,865.17
  5. Step 5: Solve for x
    x = 197,759,865.17/15,790.64
  6. Step 6: Final answer
    x = 12,523.87

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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.