Home / 81,656.42-122,436.95-31,678.11

Finding the Fourth Proportional to 81,656.42, 122,436.95 and 31,678.11

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Solution

The fourth proportional to 81,656.42, 122,436.95 and 31,678.11 is: 47,498.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,656.42 : 122,436.95 = 31,678.11 : x
  2. Step 2: Convert to fraction form
    81,656.42/122,436.95 = 31,678.11/x
  3. Step 3: Cross multiply
    81,656.42x = 122,436.95 × 31,678.11
  4. Step 4: Simplify right side
    81,656.42x = 3,878,571,170.16
  5. Step 5: Solve for x
    x = 3,878,571,170.16/81,656.42
  6. Step 6: Final answer
    x = 47,498.67

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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.