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Finding the Fourth Proportional to 21,120.48, 29,148.48 and 15,805.98

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Solution

The fourth proportional to 21,120.48, 29,148.48 and 15,805.98 is: 21,813.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.48 : 29,148.48 = 15,805.98 : x
  2. Step 2: Convert to fraction form
    21,120.48/29,148.48 = 15,805.98/x
  3. Step 3: Cross multiply
    21,120.48x = 29,148.48 × 15,805.98
  4. Step 4: Simplify right side
    21,120.48x = 460,720,291.91
  5. Step 5: Solve for x
    x = 460,720,291.91/21,120.48
  6. Step 6: Final answer
    x = 21,813.91

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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.