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Finding the Fourth Proportional to 28,463.40, 39,272.18 and 18,917.15

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Solution

The fourth proportional to 28,463.40, 39,272.18 and 18,917.15 is: 26,100.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,463.40 : 39,272.18 = 18,917.15 : x
  2. Step 2: Convert to fraction form
    28,463.40/39,272.18 = 18,917.15/x
  3. Step 3: Cross multiply
    28,463.40x = 39,272.18 × 18,917.15
  4. Step 4: Simplify right side
    28,463.40x = 742,917,428.94
  5. Step 5: Solve for x
    x = 742,917,428.94/28,463.40
  6. Step 6: Final answer
    x = 26,100.80

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1.5x scale

Why These Related Problems?

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