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Finding the Fourth Proportional to 28,412.80, 42,619.28 and 12,812.20

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Solution

The fourth proportional to 28,412.80, 42,619.28 and 12,812.20 is: 19,218.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,412.80 : 42,619.28 = 12,812.20 : x
  2. Step 2: Convert to fraction form
    28,412.80/42,619.28 = 12,812.20/x
  3. Step 3: Cross multiply
    28,412.80x = 42,619.28 × 12,812.20
  4. Step 4: Simplify right side
    28,412.80x = 546,046,739.22
  5. Step 5: Solve for x
    x = 546,046,739.22/28,412.80
  6. Step 6: Final answer
    x = 19,218.34

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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.