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Finding the Fourth Proportional to 42,868.99, 64,344.90 and 20,697.94

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Solution

The fourth proportional to 42,868.99, 64,344.90 and 20,697.94 is: 31,066.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,868.99 : 64,344.90 = 20,697.94 : x
  2. Step 2: Convert to fraction form
    42,868.99/64,344.90 = 20,697.94/x
  3. Step 3: Cross multiply
    42,868.99x = 64,344.90 × 20,697.94
  4. Step 4: Simplify right side
    42,868.99x = 1,331,806,879.51
  5. Step 5: Solve for x
    x = 1,331,806,879.51/42,868.99
  6. Step 6: Final answer
    x = 31,066.91

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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.