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Finding the Fourth Proportional to 72,801.81, 100,485.21 and 56,665.40

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Solution

The fourth proportional to 72,801.81, 100,485.21 and 56,665.40 is: 78,212.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,801.81 : 100,485.21 = 56,665.40 : x
  2. Step 2: Convert to fraction form
    72,801.81/100,485.21 = 56,665.40/x
  3. Step 3: Cross multiply
    72,801.81x = 100,485.21 × 56,665.40
  4. Step 4: Simplify right side
    72,801.81x = 5,694,034,328.80
  5. Step 5: Solve for x
    x = 5,694,034,328.80/72,801.81
  6. Step 6: Final answer
    x = 78,212.81

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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.