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Finding the Fourth Proportional to 28,645.65, 42,958.18 and 9,920.64

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Solution

The fourth proportional to 28,645.65, 42,958.18 and 9,920.64 is: 14,877.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,645.65 : 42,958.18 = 9,920.64 : x
  2. Step 2: Convert to fraction form
    28,645.65/42,958.18 = 9,920.64/x
  3. Step 3: Cross multiply
    28,645.65x = 42,958.18 × 9,920.64
  4. Step 4: Simplify right side
    28,645.65x = 426,172,812.33
  5. Step 5: Solve for x
    x = 426,172,812.33/28,645.65
  6. Step 6: Final answer
    x = 14,877.40

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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.