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Finding the Fourth Proportional to 78,891.87, 118,384.65 and 31,529.34

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Solution

The fourth proportional to 78,891.87, 118,384.65 and 31,529.34 is: 47,312.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,891.87 : 118,384.65 = 31,529.34 : x
  2. Step 2: Convert to fraction form
    78,891.87/118,384.65 = 31,529.34/x
  3. Step 3: Cross multiply
    78,891.87x = 118,384.65 × 31,529.34
  4. Step 4: Simplify right side
    78,891.87x = 3,732,589,880.63
  5. Step 5: Solve for x
    x = 3,732,589,880.63/78,891.87
  6. Step 6: Final answer
    x = 47,312.73

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1.5x scale

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.