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Finding the Fourth Proportional to 318,528.65, 477,792.98 and 81,871.56

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Solution

The fourth proportional to 318,528.65, 477,792.98 and 81,871.56 is: 122,807.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,528.65 : 477,792.98 = 81,871.56 : x
  2. Step 2: Convert to fraction form
    318,528.65/477,792.98 = 81,871.56/x
  3. Step 3: Cross multiply
    318,528.65x = 477,792.98 × 81,871.56
  4. Step 4: Simplify right side
    318,528.65x = 39,117,656,527.31
  5. Step 5: Solve for x
    x = 39,117,656,527.31/318,528.65
  6. Step 6: Final answer
    x = 122,807.34

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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.