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Finding the Fourth Proportional to 68,728.40, 103,088.85 and 18,804.89

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Solution

The fourth proportional to 68,728.40, 103,088.85 and 18,804.89 is: 28,206.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,728.40 : 103,088.85 = 18,804.89 : x
  2. Step 2: Convert to fraction form
    68,728.40/103,088.85 = 18,804.89/x
  3. Step 3: Cross multiply
    68,728.40x = 103,088.85 × 18,804.89
  4. Step 4: Simplify right side
    68,728.40x = 1,938,574,970.75
  5. Step 5: Solve for x
    x = 1,938,574,970.75/68,728.40
  6. Step 6: Final answer
    x = 28,206.32

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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.