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Finding the Fourth Proportional to 258,903.84, 388,355.36 and 81,426.32

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Solution

The fourth proportional to 258,903.84, 388,355.36 and 81,426.32 is: 122,139.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,903.84 : 388,355.36 = 81,426.32 : x
  2. Step 2: Convert to fraction form
    258,903.84/388,355.36 = 81,426.32/x
  3. Step 3: Cross multiply
    258,903.84x = 388,355.36 × 81,426.32
  4. Step 4: Simplify right side
    258,903.84x = 31,622,347,817.08
  5. Step 5: Solve for x
    x = 31,622,347,817.08/258,903.84
  6. Step 6: Final answer
    x = 122,139.35

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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.