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Finding the Fourth Proportional to 72,311.42, 100,390.84 and 70,146.29

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Solution

The fourth proportional to 72,311.42, 100,390.84 and 70,146.29 is: 97,384.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,311.42 : 100,390.84 = 70,146.29 : x
  2. Step 2: Convert to fraction form
    72,311.42/100,390.84 = 70,146.29/x
  3. Step 3: Cross multiply
    72,311.42x = 100,390.84 × 70,146.29
  4. Step 4: Simplify right side
    72,311.42x = 7,042,044,975.98
  5. Step 5: Solve for x
    x = 7,042,044,975.98/72,311.42
  6. Step 6: Final answer
    x = 97,384.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.