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Finding the Fourth Proportional to 84,376.40, 126,418.80 and 39,907.40

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Solution

The fourth proportional to 84,376.40, 126,418.80 and 39,907.40 is: 59,792.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,376.40 : 126,418.80 = 39,907.40 : x
  2. Step 2: Convert to fraction form
    84,376.40/126,418.80 = 39,907.40/x
  3. Step 3: Cross multiply
    84,376.40x = 126,418.80 × 39,907.40
  4. Step 4: Simplify right side
    84,376.40x = 5,045,045,619.12
  5. Step 5: Solve for x
    x = 5,045,045,619.12/84,376.40
  6. Step 6: Final answer
    x = 59,792.14

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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.