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Finding the Fourth Proportional to 28,480.09, 42,720.15 and 7,420.08

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Solution

The fourth proportional to 28,480.09, 42,720.15 and 7,420.08 is: 11,130.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,480.09 : 42,720.15 = 7,420.08 : x
  2. Step 2: Convert to fraction form
    28,480.09/42,720.15 = 7,420.08/x
  3. Step 3: Cross multiply
    28,480.09x = 42,720.15 × 7,420.08
  4. Step 4: Simplify right side
    28,480.09x = 316,986,930.61
  5. Step 5: Solve for x
    x = 316,986,930.61/28,480.09
  6. Step 6: Final answer
    x = 11,130.12

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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.