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Finding the Fourth Proportional to 28,244.72, 38,978.12 and 15,499.16

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Solution

The fourth proportional to 28,244.72, 38,978.12 and 15,499.16 is: 21,389.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,244.72 : 38,978.12 = 15,499.16 : x
  2. Step 2: Convert to fraction form
    28,244.72/38,978.12 = 15,499.16/x
  3. Step 3: Cross multiply
    28,244.72x = 38,978.12 × 15,499.16
  4. Step 4: Simplify right side
    28,244.72x = 604,128,254.57
  5. Step 5: Solve for x
    x = 604,128,254.57/28,244.72
  6. Step 6: Final answer
    x = 21,389.07

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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.