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Finding the Fourth Proportional to 43,870.79, 65,806.70 and 12,278.98

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Solution

The fourth proportional to 43,870.79, 65,806.70 and 12,278.98 is: 18,418.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,870.79 : 65,806.70 = 12,278.98 : x
  2. Step 2: Convert to fraction form
    43,870.79/65,806.70 = 12,278.98/x
  3. Step 3: Cross multiply
    43,870.79x = 65,806.70 × 12,278.98
  4. Step 4: Simplify right side
    43,870.79x = 808,038,762.74
  5. Step 5: Solve for x
    x = 808,038,762.74/43,870.79
  6. Step 6: Final answer
    x = 18,418.61

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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.