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Finding the Fourth Proportional to 72,172.76, 108,135.30 and 64,868.36

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Solution

The fourth proportional to 72,172.76, 108,135.30 and 64,868.36 is: 97,191.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,172.76 : 108,135.30 = 64,868.36 : x
  2. Step 2: Convert to fraction form
    72,172.76/108,135.30 = 64,868.36/x
  3. Step 3: Cross multiply
    72,172.76x = 108,135.30 × 64,868.36
  4. Step 4: Simplify right side
    72,172.76x = 7,014,559,569.11
  5. Step 5: Solve for x
    x = 7,014,559,569.11/72,172.76
  6. Step 6: Final answer
    x = 97,191.23

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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.