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Finding the Fourth Proportional to 74,878.75, 103,336.88 and 40,890.40

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Solution

The fourth proportional to 74,878.75, 103,336.88 and 40,890.40 is: 56,431.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,878.75 : 103,336.88 = 40,890.40 : x
  2. Step 2: Convert to fraction form
    74,878.75/103,336.88 = 40,890.40/x
  3. Step 3: Cross multiply
    74,878.75x = 103,336.88 × 40,890.40
  4. Step 4: Simplify right side
    74,878.75x = 4,225,485,841.27
  5. Step 5: Solve for x
    x = 4,225,485,841.27/74,878.75
  6. Step 6: Final answer
    x = 56,431.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.