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Finding the Fourth Proportional to 28,140.76, 42,213.06 and 9,420.04

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Solution

The fourth proportional to 28,140.76, 42,213.06 and 9,420.04 is: 14,130.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,140.76 : 42,213.06 = 9,420.04 : x
  2. Step 2: Convert to fraction form
    28,140.76/42,213.06 = 9,420.04/x
  3. Step 3: Cross multiply
    28,140.76x = 42,213.06 × 9,420.04
  4. Step 4: Simplify right side
    28,140.76x = 397,648,608.19
  5. Step 5: Solve for x
    x = 397,648,608.19/28,140.76
  6. Step 6: Final answer
    x = 14,130.70

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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.