Home / 20,285.92-30,428.88-7,638.05

Finding the Fourth Proportional to 20,285.92, 30,428.88 and 7,638.05

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Solution

The fourth proportional to 20,285.92, 30,428.88 and 7,638.05 is: 11,457.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,285.92 : 30,428.88 = 7,638.05 : x
  2. Step 2: Convert to fraction form
    20,285.92/30,428.88 = 7,638.05/x
  3. Step 3: Cross multiply
    20,285.92x = 30,428.88 × 7,638.05
  4. Step 4: Simplify right side
    20,285.92x = 232,417,354.31
  5. Step 5: Solve for x
    x = 232,417,354.31/20,285.92
  6. Step 6: Final answer
    x = 11,457.08

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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.