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Finding the Fourth Proportional to 19,139.70, 28,709.55 and 12,902.70

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Solution

The fourth proportional to 19,139.70, 28,709.55 and 12,902.70 is: 19,354.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,139.70 : 28,709.55 = 12,902.70 : x
  2. Step 2: Convert to fraction form
    19,139.70/28,709.55 = 12,902.70/x
  3. Step 3: Cross multiply
    19,139.70x = 28,709.55 × 12,902.70
  4. Step 4: Simplify right side
    19,139.70x = 370,430,710.79
  5. Step 5: Solve for x
    x = 370,430,710.79/19,139.70
  6. Step 6: Final answer
    x = 19,354.05

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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.