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Finding the Fourth Proportional to 15,699.71, 21,666.80 and 8,987.44

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Solution

The fourth proportional to 15,699.71, 21,666.80 and 8,987.44 is: 12,403.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,699.71 : 21,666.80 = 8,987.44 : x
  2. Step 2: Convert to fraction form
    15,699.71/21,666.80 = 8,987.44/x
  3. Step 3: Cross multiply
    15,699.71x = 21,666.80 × 8,987.44
  4. Step 4: Simplify right side
    15,699.71x = 194,728,911.72
  5. Step 5: Solve for x
    x = 194,728,911.72/15,699.71
  6. Step 6: Final answer
    x = 12,403.35

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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.