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Finding the Fourth Proportional to 212,762.70, 318,872.70 and 112,970.70

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Solution

The fourth proportional to 212,762.70, 318,872.70 and 112,970.70 is: 169,311.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,762.70 : 318,872.70 = 112,970.70 : x
  2. Step 2: Convert to fraction form
    212,762.70/318,872.70 = 112,970.70/x
  3. Step 3: Cross multiply
    212,762.70x = 318,872.70 × 112,970.70
  4. Step 4: Simplify right side
    212,762.70x = 36,023,272,129.89
  5. Step 5: Solve for x
    x = 36,023,272,129.89/212,762.70
  6. Step 6: Final answer
    x = 169,311.97

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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.