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Finding the Fourth Proportional to 19,158.65, 28,737.64 and 8,621.21

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Solution

The fourth proportional to 19,158.65, 28,737.64 and 8,621.21 is: 12,931.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,158.65 : 28,737.64 = 8,621.21 : x
  2. Step 2: Convert to fraction form
    19,158.65/28,737.64 = 8,621.21/x
  3. Step 3: Cross multiply
    19,158.65x = 28,737.64 × 8,621.21
  4. Step 4: Simplify right side
    19,158.65x = 247,753,182.65
  5. Step 5: Solve for x
    x = 247,753,182.65/19,158.65
  6. Step 6: Final answer
    x = 12,931.67

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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.