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Finding the Fourth Proportional to 28,406.16, 42,609.78 and 9,690.48

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Solution

The fourth proportional to 28,406.16, 42,609.78 and 9,690.48 is: 14,535.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,406.16 : 42,609.78 = 9,690.48 : x
  2. Step 2: Convert to fraction form
    28,406.16/42,609.78 = 9,690.48/x
  3. Step 3: Cross multiply
    28,406.16x = 42,609.78 × 9,690.48
  4. Step 4: Simplify right side
    28,406.16x = 412,909,220.89
  5. Step 5: Solve for x
    x = 412,909,220.89/28,406.16
  6. Step 6: Final answer
    x = 14,535.90

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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.