Home / 15,660.64-21,606.88-9,690.20

Finding the Fourth Proportional to 15,660.64, 21,606.88 and 9,690.20

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Solution

The fourth proportional to 15,660.64, 21,606.88 and 9,690.20 is: 13,369.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,660.64 : 21,606.88 = 9,690.20 : x
  2. Step 2: Convert to fraction form
    15,660.64/21,606.88 = 9,690.20/x
  3. Step 3: Cross multiply
    15,660.64x = 21,606.88 × 9,690.20
  4. Step 4: Simplify right side
    15,660.64x = 209,374,988.58
  5. Step 5: Solve for x
    x = 209,374,988.58/15,660.64
  6. Step 6: Final answer
    x = 13,369.50

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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.