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Finding the Fourth Proportional to 28,636.96, 42,945.13 and 9,911.91

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Solution

The fourth proportional to 28,636.96, 42,945.13 and 9,911.91 is: 14,864.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,636.96 : 42,945.13 = 9,911.91 : x
  2. Step 2: Convert to fraction form
    28,636.96/42,945.13 = 9,911.91/x
  3. Step 3: Cross multiply
    28,636.96x = 42,945.13 × 9,911.91
  4. Step 4: Simplify right side
    28,636.96x = 425,668,263.50
  5. Step 5: Solve for x
    x = 425,668,263.50/28,636.96
  6. Step 6: Final answer
    x = 14,864.30

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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.