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Finding the Fourth Proportional to 28,127.90, 38,814.90 and 15,551.84

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Solution

The fourth proportional to 28,127.90, 38,814.90 and 15,551.84 is: 21,460.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,127.90 : 38,814.90 = 15,551.84 : x
  2. Step 2: Convert to fraction form
    28,127.90/38,814.90 = 15,551.84/x
  3. Step 3: Cross multiply
    28,127.90x = 38,814.90 × 15,551.84
  4. Step 4: Simplify right side
    28,127.90x = 603,643,114.42
  5. Step 5: Solve for x
    x = 603,643,114.42/28,127.90
  6. Step 6: Final answer
    x = 21,460.65

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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.