Home / 19,780.38-29,670.53-4,990.46

Finding the Fourth Proportional to 19,780.38, 29,670.53 and 4,990.46

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Solution

The fourth proportional to 19,780.38, 29,670.53 and 4,990.46 is: 7,485.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,780.38 : 29,670.53 = 4,990.46 : x
  2. Step 2: Convert to fraction form
    19,780.38/29,670.53 = 4,990.46/x
  3. Step 3: Cross multiply
    19,780.38x = 29,670.53 × 4,990.46
  4. Step 4: Simplify right side
    19,780.38x = 148,069,419.84
  5. Step 5: Solve for x
    x = 148,069,419.84/19,780.38
  6. Step 6: Final answer
    x = 7,485.67

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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.