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Finding the Fourth Proportional to 103,778.60, 155,666.30 and 70,415.72

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Solution

The fourth proportional to 103,778.60, 155,666.30 and 70,415.72 is: 105,622.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,778.60 : 155,666.30 = 70,415.72 : x
  2. Step 2: Convert to fraction form
    103,778.60/155,666.30 = 70,415.72/x
  3. Step 3: Cross multiply
    103,778.60x = 155,666.30 × 70,415.72
  4. Step 4: Simplify right side
    103,778.60x = 10,961,354,594.24
  5. Step 5: Solve for x
    x = 10,961,354,594.24/103,778.60
  6. Step 6: Final answer
    x = 105,622.49

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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.