Home / 21,720.32-32,574.62-7,678.50

Finding the Fourth Proportional to 21,720.32, 32,574.62 and 7,678.50

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Solution

The fourth proportional to 21,720.32, 32,574.62 and 7,678.50 is: 11,515.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.32 : 32,574.62 = 7,678.50 : x
  2. Step 2: Convert to fraction form
    21,720.32/32,574.62 = 7,678.50/x
  3. Step 3: Cross multiply
    21,720.32x = 32,574.62 × 7,678.50
  4. Step 4: Simplify right side
    21,720.32x = 250,124,219.67
  5. Step 5: Solve for x
    x = 250,124,219.67/21,720.32
  6. Step 6: Final answer
    x = 11,515.68

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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.