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Finding the Fourth Proportional to 72,010.80, 107,870.40 and 40,809.60

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Solution

The fourth proportional to 72,010.80, 107,870.40 and 40,809.60 is: 61,131.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,010.80 : 107,870.40 = 40,809.60 : x
  2. Step 2: Convert to fraction form
    72,010.80/107,870.40 = 40,809.60/x
  3. Step 3: Cross multiply
    72,010.80x = 107,870.40 × 40,809.60
  4. Step 4: Simplify right side
    72,010.80x = 4,402,147,875.84
  5. Step 5: Solve for x
    x = 4,402,147,875.84/72,010.80
  6. Step 6: Final answer
    x = 61,131.77

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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.