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Finding the Fourth Proportional to 15,699.66, 21,665.46 and 8,985.25

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Solution

The fourth proportional to 15,699.66, 21,665.46 and 8,985.25 is: 12,399.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,699.66 : 21,665.46 = 8,985.25 : x
  2. Step 2: Convert to fraction form
    15,699.66/21,665.46 = 8,985.25/x
  3. Step 3: Cross multiply
    15,699.66x = 21,665.46 × 8,985.25
  4. Step 4: Simplify right side
    15,699.66x = 194,669,574.47
  5. Step 5: Solve for x
    x = 194,669,574.47/15,699.66
  6. Step 6: Final answer
    x = 12,399.60

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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.