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Finding the Fourth Proportional to 28,059.71, 38,722.62 and 15,312.99

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Solution

The fourth proportional to 28,059.71, 38,722.62 and 15,312.99 is: 21,132.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,059.71 : 38,722.62 = 15,312.99 : x
  2. Step 2: Convert to fraction form
    28,059.71/38,722.62 = 15,312.99/x
  3. Step 3: Cross multiply
    28,059.71x = 38,722.62 × 15,312.99
  4. Step 4: Simplify right side
    28,059.71x = 592,958,991.52
  5. Step 5: Solve for x
    x = 592,958,991.52/28,059.71
  6. Step 6: Final answer
    x = 21,132.05

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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.