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Finding the Fourth Proportional to 28,498.62, 42,748.81 and 9,778.40

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Solution

The fourth proportional to 28,498.62, 42,748.81 and 9,778.40 is: 14,667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,498.62 : 42,748.81 = 9,778.40 : x
  2. Step 2: Convert to fraction form
    28,498.62/42,748.81 = 9,778.40/x
  3. Step 3: Cross multiply
    28,498.62x = 42,748.81 × 9,778.40
  4. Step 4: Simplify right side
    28,498.62x = 418,014,885.82
  5. Step 5: Solve for x
    x = 418,014,885.82/28,498.62
  6. Step 6: Final answer
    x = 14,667.90

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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.