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Finding the Fourth Proportional to 28,409.65, 42,614.46 and 8,688.21

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Solution

The fourth proportional to 28,409.65, 42,614.46 and 8,688.21 is: 13,032.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,409.65 : 42,614.46 = 8,688.21 : x
  2. Step 2: Convert to fraction form
    28,409.65/42,614.46 = 8,688.21/x
  3. Step 3: Cross multiply
    28,409.65x = 42,614.46 × 8,688.21
  4. Step 4: Simplify right side
    28,409.65x = 370,243,377.52
  5. Step 5: Solve for x
    x = 370,243,377.52/28,409.65
  6. Step 6: Final answer
    x = 13,032.31

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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.