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Finding the Fourth Proportional to 28,101.70, 38,782.89 and 15,530.50

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Solution

The fourth proportional to 28,101.70, 38,782.89 and 15,530.50 is: 21,433.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,101.70 : 38,782.89 = 15,530.50 : x
  2. Step 2: Convert to fraction form
    28,101.70/38,782.89 = 15,530.50/x
  3. Step 3: Cross multiply
    28,101.70x = 38,782.89 × 15,530.50
  4. Step 4: Simplify right side
    28,101.70x = 602,317,673.15
  5. Step 5: Solve for x
    x = 602,317,673.15/28,101.70
  6. Step 6: Final answer
    x = 21,433.50

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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.