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Finding the Fourth Proportional to 7,980.15, 11,009.75 and 4,621.13

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Solution

The fourth proportional to 7,980.15, 11,009.75 and 4,621.13 is: 6,375.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980.15 : 11,009.75 = 4,621.13 : x
  2. Step 2: Convert to fraction form
    7,980.15/11,009.75 = 4,621.13/x
  3. Step 3: Cross multiply
    7,980.15x = 11,009.75 × 4,621.13
  4. Step 4: Simplify right side
    7,980.15x = 50,877,486.02
  5. Step 5: Solve for x
    x = 50,877,486.02/7,980.15
  6. Step 6: Final answer
    x = 6,375.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.