Home / 12,621.51-18,907.56-7,678.89

Finding the Fourth Proportional to 12,621.51, 18,907.56 and 7,678.89

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Solution

The fourth proportional to 12,621.51, 18,907.56 and 7,678.89 is: 11,503.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,621.51 : 18,907.56 = 7,678.89 : x
  2. Step 2: Convert to fraction form
    12,621.51/18,907.56 = 7,678.89/x
  3. Step 3: Cross multiply
    12,621.51x = 18,907.56 × 7,678.89
  4. Step 4: Simplify right side
    12,621.51x = 145,189,073.41
  5. Step 5: Solve for x
    x = 145,189,073.41/12,621.51
  6. Step 6: Final answer
    x = 11,503.30

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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.