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Finding the Fourth Proportional to 79,978.40, 119,809.20 and 70,128.80

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Solution

The fourth proportional to 79,978.40, 119,809.20 and 70,128.80 is: 105,054.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,978.40 : 119,809.20 = 70,128.80 : x
  2. Step 2: Convert to fraction form
    79,978.40/119,809.20 = 70,128.80/x
  3. Step 3: Cross multiply
    79,978.40x = 119,809.20 × 70,128.80
  4. Step 4: Simplify right side
    79,978.40x = 8,402,075,424.96
  5. Step 5: Solve for x
    x = 8,402,075,424.96/79,978.40
  6. Step 6: Final answer
    x = 105,054.31

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