Home / 1,620.38-2,235.84-921.62

Finding the Fourth Proportional to 1,620.38, 2,235.84 and 921.62

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Solution

The fourth proportional to 1,620.38, 2,235.84 and 921.62 is: 1,271.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.38 : 2,235.84 = 921.62 : x
  2. Step 2: Convert to fraction form
    1,620.38/2,235.84 = 921.62/x
  3. Step 3: Cross multiply
    1,620.38x = 2,235.84 × 921.62
  4. Step 4: Simplify right side
    1,620.38x = 2,060,594.86
  5. Step 5: Solve for x
    x = 2,060,594.86/1,620.38
  6. Step 6: Final answer
    x = 1,271.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.