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Finding the Fourth Proportional to 28,357.60, 42,536.40 and 12,805.60

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Solution

The fourth proportional to 28,357.60, 42,536.40 and 12,805.60 is: 19,208.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,357.60 : 42,536.40 = 12,805.60 : x
  2. Step 2: Convert to fraction form
    28,357.60/42,536.40 = 12,805.60/x
  3. Step 3: Cross multiply
    28,357.60x = 42,536.40 × 12,805.60
  4. Step 4: Simplify right side
    28,357.60x = 544,704,123.84
  5. Step 5: Solve for x
    x = 544,704,123.84/28,357.60
  6. Step 6: Final answer
    x = 19,208.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.