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Finding the Fourth Proportional to 28,378.65, 42,570.42 and 7,318.50

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Solution

The fourth proportional to 28,378.65, 42,570.42 and 7,318.50 is: 10,978.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,378.65 : 42,570.42 = 7,318.50 : x
  2. Step 2: Convert to fraction form
    28,378.65/42,570.42 = 7,318.50/x
  3. Step 3: Cross multiply
    28,378.65x = 42,570.42 × 7,318.50
  4. Step 4: Simplify right side
    28,378.65x = 311,551,582.18
  5. Step 5: Solve for x
    x = 311,551,582.18/28,378.65
  6. Step 6: Final answer
    x = 10,978.38

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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.