Home / 20,830.84-31,240.69-7,681.50

Finding the Fourth Proportional to 20,830.84, 31,240.69 and 7,681.50

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Solution

The fourth proportional to 20,830.84, 31,240.69 and 7,681.50 is: 11,520.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,830.84 : 31,240.69 = 7,681.50 : x
  2. Step 2: Convert to fraction form
    20,830.84/31,240.69 = 7,681.50/x
  3. Step 3: Cross multiply
    20,830.84x = 31,240.69 × 7,681.50
  4. Step 4: Simplify right side
    20,830.84x = 239,975,341.03
  5. Step 5: Solve for x
    x = 239,975,341.03/20,830.84
  6. Step 6: Final answer
    x = 11,520.20

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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.