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Finding the Fourth Proportional to 72,170.50, 99,599.94 and 40,339.52

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Solution

The fourth proportional to 72,170.50, 99,599.94 and 40,339.52 is: 55,671.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,170.50 : 99,599.94 = 40,339.52 : x
  2. Step 2: Convert to fraction form
    72,170.50/99,599.94 = 40,339.52/x
  3. Step 3: Cross multiply
    72,170.50x = 99,599.94 × 40,339.52
  4. Step 4: Simplify right side
    72,170.50x = 4,017,813,771.63
  5. Step 5: Solve for x
    x = 4,017,813,771.63/72,170.50
  6. Step 6: Final answer
    x = 55,671.14

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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.