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Finding the Fourth Proportional to 30,020.40, 45,025.20 and 18,907.20

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Solution

The fourth proportional to 30,020.40, 45,025.20 and 18,907.20 is: 28,357.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,020.40 : 45,025.20 = 18,907.20 : x
  2. Step 2: Convert to fraction form
    30,020.40/45,025.20 = 18,907.20/x
  3. Step 3: Cross multiply
    30,020.40x = 45,025.20 × 18,907.20
  4. Step 4: Simplify right side
    30,020.40x = 851,300,461.44
  5. Step 5: Solve for x
    x = 851,300,461.44/30,020.40
  6. Step 6: Final answer
    x = 28,357.40

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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.