Home / 80,583.40-120,875.10-21,428.20

Finding the Fourth Proportional to 80,583.40, 120,875.10 and 21,428.20

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Solution

The fourth proportional to 80,583.40, 120,875.10 and 21,428.20 is: 32,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,583.40 : 120,875.10 = 21,428.20 : x
  2. Step 2: Convert to fraction form
    80,583.40/120,875.10 = 21,428.20/x
  3. Step 3: Cross multiply
    80,583.40x = 120,875.10 × 21,428.20
  4. Step 4: Simplify right side
    80,583.40x = 2,590,135,817.82
  5. Step 5: Solve for x
    x = 2,590,135,817.82/80,583.40
  6. Step 6: Final answer
    x = 32,142.30

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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.