Home / 85,379,407.53-128,120,117.09-78,433,016.78

Finding the Fourth Proportional to 85,379,407.53, 128,120,117.09 and 78,433,016.78

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Solution

The fourth proportional to 85,379,407.53, 128,120,117.09 and 78,433,016.78 is: 117,696,381.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,379,407.53 : 128,120,117.09 = 78,433,016.78 : x
  2. Step 2: Convert to fraction form
    85,379,407.53/128,120,117.09 = 78,433,016.78/x
  3. Step 3: Cross multiply
    85,379,407.53x = 128,120,117.09 × 78,433,016.78
  4. Step 4: Simplify right side
    85,379,407.53x = 10,048,847,293,363,408
  5. Step 5: Solve for x
    x = 10,048,847,293,363,408/85,379,407.53
  6. Step 6: Final answer
    x = 117,696,381.18

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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.