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Finding the Fourth Proportional to 72,683.84, 100,300.20 and 40,855.70

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Solution

The fourth proportional to 72,683.84, 100,300.20 and 40,855.70 is: 56,378.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,683.84 : 100,300.20 = 40,855.70 : x
  2. Step 2: Convert to fraction form
    72,683.84/100,300.20 = 40,855.70/x
  3. Step 3: Cross multiply
    72,683.84x = 100,300.20 × 40,855.70
  4. Step 4: Simplify right side
    72,683.84x = 4,097,834,881.14
  5. Step 5: Solve for x
    x = 4,097,834,881.14/72,683.84
  6. Step 6: Final answer
    x = 56,378.90

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1.5x scale

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.