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Finding the Fourth Proportional to 15,700.68, 21,657.86 and 9,409.40

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Solution

The fourth proportional to 15,700.68, 21,657.86 and 9,409.40 is: 12,979.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,700.68 : 21,657.86 = 9,409.40 : x
  2. Step 2: Convert to fraction form
    15,700.68/21,657.86 = 9,409.40/x
  3. Step 3: Cross multiply
    15,700.68x = 21,657.86 × 9,409.40
  4. Step 4: Simplify right side
    15,700.68x = 203,787,467.88
  5. Step 5: Solve for x
    x = 203,787,467.88/15,700.68
  6. Step 6: Final answer
    x = 12,979.53

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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.