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Finding the Fourth Proportional to 19,209, 28,818.36 and 5,358

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Solution

The fourth proportional to 19,209, 28,818.36 and 5,358 is: 8,038.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,209 : 28,818.36 = 5,358 : x
  2. Step 2: Convert to fraction form
    19,209/28,818.36 = 5,358/x
  3. Step 3: Cross multiply
    19,209x = 28,818.36 × 5,358
  4. Step 4: Simplify right side
    19,209x = 154,408,772.88
  5. Step 5: Solve for x
    x = 154,408,772.88/19,209
  6. Step 6: Final answer
    x = 8,038.36

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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.