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Finding the Fourth Proportional to 21,372.88, 29,502.80 and 19,130.80

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Solution

The fourth proportional to 21,372.88, 29,502.80 and 19,130.80 is: 26,407.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,372.88 : 29,502.80 = 19,130.80 : x
  2. Step 2: Convert to fraction form
    21,372.88/29,502.80 = 19,130.80/x
  3. Step 3: Cross multiply
    21,372.88x = 29,502.80 × 19,130.80
  4. Step 4: Simplify right side
    21,372.88x = 564,411,923.07
  5. Step 5: Solve for x
    x = 564,411,923.07/21,372.88
  6. Step 6: Final answer
    x = 26,407.86

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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.