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Finding the Fourth Proportional to 212,323.16, 318,386.33 and 79,167.67

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Solution

The fourth proportional to 212,323.16, 318,386.33 and 79,167.67 is: 118,714.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,323.16 : 318,386.33 = 79,167.67 : x
  2. Step 2: Convert to fraction form
    212,323.16/318,386.33 = 79,167.67/x
  3. Step 3: Cross multiply
    212,323.16x = 318,386.33 × 79,167.67
  4. Step 4: Simplify right side
    212,323.16x = 25,205,903,904.88
  5. Step 5: Solve for x
    x = 25,205,903,904.88/212,323.16
  6. Step 6: Final answer
    x = 118,714.81

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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.