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Finding the Fourth Proportional to 28,216.40, 38,935.88 and 15,640.88

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Solution

The fourth proportional to 28,216.40, 38,935.88 and 15,640.88 is: 21,582.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,216.40 : 38,935.88 = 15,640.88 : x
  2. Step 2: Convert to fraction form
    28,216.40/38,935.88 = 15,640.88/x
  3. Step 3: Cross multiply
    28,216.40x = 38,935.88 × 15,640.88
  4. Step 4: Simplify right side
    28,216.40x = 608,991,426.77
  5. Step 5: Solve for x
    x = 608,991,426.77/28,216.40
  6. Step 6: Final answer
    x = 21,582.89

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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.