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Finding the Fourth Proportional to 72,962.36, 100,688.04 and 39,428.36

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Solution

The fourth proportional to 72,962.36, 100,688.04 and 39,428.36 is: 54,411.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,962.36 : 100,688.04 = 39,428.36 : x
  2. Step 2: Convert to fraction form
    72,962.36/100,688.04 = 39,428.36/x
  3. Step 3: Cross multiply
    72,962.36x = 100,688.04 × 39,428.36
  4. Step 4: Simplify right side
    72,962.36x = 3,969,964,288.81
  5. Step 5: Solve for x
    x = 3,969,964,288.81/72,962.36
  6. Step 6: Final answer
    x = 54,411.13

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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.