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Finding the Fourth Proportional to 28,683.88, 42,946.08 and 21,642.65

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Solution

The fourth proportional to 28,683.88, 42,946.08 and 21,642.65 is: 32,403.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,683.88 : 42,946.08 = 21,642.65 : x
  2. Step 2: Convert to fraction form
    28,683.88/42,946.08 = 21,642.65/x
  3. Step 3: Cross multiply
    28,683.88x = 42,946.08 × 21,642.65
  4. Step 4: Simplify right side
    28,683.88x = 929,466,978.31
  5. Step 5: Solve for x
    x = 929,466,978.31/28,683.88
  6. Step 6: Final answer
    x = 32,403.81

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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.