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Finding the Fourth Proportional to 72,803.97, 109,140.93 and 28,420.38

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Solution

The fourth proportional to 72,803.97, 109,140.93 and 28,420.38 is: 42,605.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,803.97 : 109,140.93 = 28,420.38 : x
  2. Step 2: Convert to fraction form
    72,803.97/109,140.93 = 28,420.38/x
  3. Step 3: Cross multiply
    72,803.97x = 109,140.93 × 28,420.38
  4. Step 4: Simplify right side
    72,803.97x = 3,101,826,704.15
  5. Step 5: Solve for x
    x = 3,101,826,704.15/72,803.97
  6. Step 6: Final answer
    x = 42,605.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.