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Finding the Fourth Proportional to 42,804.21, 64,209.41 and 13,218.22

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Solution

The fourth proportional to 42,804.21, 64,209.41 and 13,218.22 is: 19,828.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,804.21 : 64,209.41 = 13,218.22 : x
  2. Step 2: Convert to fraction form
    42,804.21/64,209.41 = 13,218.22/x
  3. Step 3: Cross multiply
    42,804.21x = 64,209.41 × 13,218.22
  4. Step 4: Simplify right side
    42,804.21x = 848,734,171.19
  5. Step 5: Solve for x
    x = 848,734,171.19/42,804.21
  6. Step 6: Final answer
    x = 19,828.29

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1.5x scale

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.