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Finding the Fourth Proportional to 78,638.40, 110,404.80 and 78,638.40

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Solution

The fourth proportional to 78,638.40, 110,404.80 and 78,638.40 is: 110,404.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,638.40 : 110,404.80 = 78,638.40 : x
  2. Step 2: Convert to fraction form
    78,638.40/110,404.80 = 78,638.40/x
  3. Step 3: Cross multiply
    78,638.40x = 110,404.80 × 78,638.40
  4. Step 4: Simplify right side
    78,638.40x = 8,682,056,824.32
  5. Step 5: Solve for x
    x = 8,682,056,824.32/78,638.40
  6. Step 6: Final answer
    x = 110,404.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.