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Finding the Fourth Proportional to 8,712.40, 13,075.80 and 4,039.60

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Solution

The fourth proportional to 8,712.40, 13,075.80 and 4,039.60 is: 6,062.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.40 : 13,075.80 = 4,039.60 : x
  2. Step 2: Convert to fraction form
    8,712.40/13,075.80 = 4,039.60/x
  3. Step 3: Cross multiply
    8,712.40x = 13,075.80 × 4,039.60
  4. Step 4: Simplify right side
    8,712.40x = 52,821,001.68
  5. Step 5: Solve for x
    x = 52,821,001.68/8,712.40
  6. Step 6: Final answer
    x = 6,062.74

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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.