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Finding the Fourth Proportional to 72,751.50, 100,381.95 and 42,530.90

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Solution

The fourth proportional to 72,751.50, 100,381.95 and 42,530.90 is: 58,683.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,751.50 : 100,381.95 = 42,530.90 : x
  2. Step 2: Convert to fraction form
    72,751.50/100,381.95 = 42,530.90/x
  3. Step 3: Cross multiply
    72,751.50x = 100,381.95 × 42,530.90
  4. Step 4: Simplify right side
    72,751.50x = 4,269,334,175.35
  5. Step 5: Solve for x
    x = 4,269,334,175.35/72,751.50
  6. Step 6: Final answer
    x = 58,683.80

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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.