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Finding the Fourth Proportional to 28,132.80, 42,208.80 and 12,555.20

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Solution

The fourth proportional to 28,132.80, 42,208.80 and 12,555.20 is: 18,837.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,132.80 : 42,208.80 = 12,555.20 : x
  2. Step 2: Convert to fraction form
    28,132.80/42,208.80 = 12,555.20/x
  3. Step 3: Cross multiply
    28,132.80x = 42,208.80 × 12,555.20
  4. Step 4: Simplify right side
    28,132.80x = 529,939,925.76
  5. Step 5: Solve for x
    x = 529,939,925.76/28,132.80
  6. Step 6: Final answer
    x = 18,837.08

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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.