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Finding the Fourth Proportional to 109,316.80, 163,942.80 and 42,718.60

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Solution

The fourth proportional to 109,316.80, 163,942.80 and 42,718.60 is: 64,065.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,316.80 : 163,942.80 = 42,718.60 : x
  2. Step 2: Convert to fraction form
    109,316.80/163,942.80 = 42,718.60/x
  3. Step 3: Cross multiply
    109,316.80x = 163,942.80 × 42,718.60
  4. Step 4: Simplify right side
    109,316.80x = 7,003,406,896.08
  5. Step 5: Solve for x
    x = 7,003,406,896.08/109,316.80
  6. Step 6: Final answer
    x = 64,065.24

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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.