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Finding the Fourth Proportional to 28,606.40, 42,870.11 and 20,645.45

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Solution

The fourth proportional to 28,606.40, 42,870.11 and 20,645.45 is: 30,939.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,606.40 : 42,870.11 = 20,645.45 : x
  2. Step 2: Convert to fraction form
    28,606.40/42,870.11 = 20,645.45/x
  3. Step 3: Cross multiply
    28,606.40x = 42,870.11 × 20,645.45
  4. Step 4: Simplify right side
    28,606.40x = 885,072,394.92
  5. Step 5: Solve for x
    x = 885,072,394.92/28,606.40
  6. Step 6: Final answer
    x = 30,939.67

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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.