Home / 212,103.18-318,385.31-85,830.35

Finding the Fourth Proportional to 212,103.18, 318,385.31 and 85,830.35

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Solution

The fourth proportional to 212,103.18, 318,385.31 and 85,830.35 is: 128,838.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,103.18 : 318,385.31 = 85,830.35 : x
  2. Step 2: Convert to fraction form
    212,103.18/318,385.31 = 85,830.35/x
  3. Step 3: Cross multiply
    212,103.18x = 318,385.31 × 85,830.35
  4. Step 4: Simplify right side
    212,103.18x = 27,327,122,592.16
  5. Step 5: Solve for x
    x = 27,327,122,592.16/212,103.18
  6. Step 6: Final answer
    x = 128,838.82

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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.