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Finding the Fourth Proportional to 103,140.66, 154,711.08 and 28,261.40

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Solution

The fourth proportional to 103,140.66, 154,711.08 and 28,261.40 is: 42,392.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,140.66 : 154,711.08 = 28,261.40 : x
  2. Step 2: Convert to fraction form
    103,140.66/154,711.08 = 28,261.40/x
  3. Step 3: Cross multiply
    103,140.66x = 154,711.08 × 28,261.40
  4. Step 4: Simplify right side
    103,140.66x = 4,372,351,716.31
  5. Step 5: Solve for x
    x = 4,372,351,716.31/103,140.66
  6. Step 6: Final answer
    x = 42,392.12

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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.