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Finding the Fourth Proportional to 51,312.80, 70,811.44 and 28,956.80

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Solution

The fourth proportional to 51,312.80, 70,811.44 and 28,956.80 is: 39,960.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,312.80 : 70,811.44 = 28,956.80 : x
  2. Step 2: Convert to fraction form
    51,312.80/70,811.44 = 28,956.80/x
  3. Step 3: Cross multiply
    51,312.80x = 70,811.44 × 28,956.80
  4. Step 4: Simplify right side
    51,312.80x = 2,050,472,705.79
  5. Step 5: Solve for x
    x = 2,050,472,705.79/51,312.80
  6. Step 6: Final answer
    x = 39,960.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.