Home / 20,678.90-30,999.11-7,528.28

Finding the Fourth Proportional to 20,678.90, 30,999.11 and 7,528.28

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Solution

The fourth proportional to 20,678.90, 30,999.11 and 7,528.28 is: 11,285.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,678.90 : 30,999.11 = 7,528.28 : x
  2. Step 2: Convert to fraction form
    20,678.90/30,999.11 = 7,528.28/x
  3. Step 3: Cross multiply
    20,678.90x = 30,999.11 × 7,528.28
  4. Step 4: Simplify right side
    20,678.90x = 233,369,787.19
  5. Step 5: Solve for x
    x = 233,369,787.19/20,678.90
  6. Step 6: Final answer
    x = 11,285.41

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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.