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Finding the Fourth Proportional to 28,280.20, 42,420.30 and 7,220.20

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Solution

The fourth proportional to 28,280.20, 42,420.30 and 7,220.20 is: 10,830.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,280.20 : 42,420.30 = 7,220.20 : x
  2. Step 2: Convert to fraction form
    28,280.20/42,420.30 = 7,220.20/x
  3. Step 3: Cross multiply
    28,280.20x = 42,420.30 × 7,220.20
  4. Step 4: Simplify right side
    28,280.20x = 306,283,050.06
  5. Step 5: Solve for x
    x = 306,283,050.06/28,280.20
  6. Step 6: Final answer
    x = 10,830.30

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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.