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Finding the Fourth Proportional to 72,813.90, 100,485.87 and 40,985.76

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Solution

The fourth proportional to 72,813.90, 100,485.87 and 40,985.76 is: 56,561.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,813.90 : 100,485.87 = 40,985.76 : x
  2. Step 2: Convert to fraction form
    72,813.90/100,485.87 = 40,985.76/x
  3. Step 3: Cross multiply
    72,813.90x = 100,485.87 × 40,985.76
  4. Step 4: Simplify right side
    72,813.90x = 4,118,489,751.21
  5. Step 5: Solve for x
    x = 4,118,489,751.21/72,813.90
  6. Step 6: Final answer
    x = 56,561.86

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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.