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Finding the Fourth Proportional to 28,607.18, 39,478.43 and 15,687.51

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Solution

The fourth proportional to 28,607.18, 39,478.43 and 15,687.51 is: 21,649.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,607.18 : 39,478.43 = 15,687.51 : x
  2. Step 2: Convert to fraction form
    28,607.18/39,478.43 = 15,687.51/x
  3. Step 3: Cross multiply
    28,607.18x = 39,478.43 × 15,687.51
  4. Step 4: Simplify right side
    28,607.18x = 619,318,212.83
  5. Step 5: Solve for x
    x = 619,318,212.83/28,607.18
  6. Step 6: Final answer
    x = 21,649.04

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.