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Finding the Fourth Proportional to 85,786,009.60, 128,697,676.80 and 28,268,492.80

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Solution

The fourth proportional to 85,786,009.60, 128,697,676.80 and 28,268,492.80 is: 42,408,888.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,786,009.60 : 128,697,676.80 = 28,268,492.80 : x
  2. Step 2: Convert to fraction form
    85,786,009.60/128,697,676.80 = 28,268,492.80/x
  3. Step 3: Cross multiply
    85,786,009.60x = 128,697,676.80 × 28,268,492.80
  4. Step 4: Simplify right side
    85,786,009.60x = 3,638,089,349,997,527
  5. Step 5: Solve for x
    x = 3,638,089,349,997,527/85,786,009.60
  6. Step 6: Final answer
    x = 42,408,888.90

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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.