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Finding the Fourth Proportional to 21,666.69, 29,905.47 and 12,240.72

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Solution

The fourth proportional to 21,666.69, 29,905.47 and 12,240.72 is: 16,895.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,666.69 : 29,905.47 = 12,240.72 : x
  2. Step 2: Convert to fraction form
    21,666.69/29,905.47 = 12,240.72/x
  3. Step 3: Cross multiply
    21,666.69x = 29,905.47 × 12,240.72
  4. Step 4: Simplify right side
    21,666.69x = 366,064,484.74
  5. Step 5: Solve for x
    x = 366,064,484.74/21,666.69
  6. Step 6: Final answer
    x = 16,895.27

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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.