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Finding the Fourth Proportional to 28,561.62, 42,840.81 and 7,783.50

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Solution

The fourth proportional to 28,561.62, 42,840.81 and 7,783.50 is: 11,674.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,561.62 : 42,840.81 = 7,783.50 : x
  2. Step 2: Convert to fraction form
    28,561.62/42,840.81 = 7,783.50/x
  3. Step 3: Cross multiply
    28,561.62x = 42,840.81 × 7,783.50
  4. Step 4: Simplify right side
    28,561.62x = 333,451,444.64
  5. Step 5: Solve for x
    x = 333,451,444.64/28,561.62
  6. Step 6: Final answer
    x = 11,674.81

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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.