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Finding the Fourth Proportional to 28,237.99, 38,968.16 and 15,490.91

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Solution

The fourth proportional to 28,237.99, 38,968.16 and 15,490.91 is: 21,377.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,237.99 : 38,968.16 = 15,490.91 : x
  2. Step 2: Convert to fraction form
    28,237.99/38,968.16 = 15,490.91/x
  3. Step 3: Cross multiply
    28,237.99x = 38,968.16 × 15,490.91
  4. Step 4: Simplify right side
    28,237.99x = 603,651,987.13
  5. Step 5: Solve for x
    x = 603,651,987.13/28,237.99
  6. Step 6: Final answer
    x = 21,377.30

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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.