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Finding the Fourth Proportional to 278,969.40, 418,421.70 and 79,320.60

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Solution

The fourth proportional to 278,969.40, 418,421.70 and 79,320.60 is: 118,971.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,969.40 : 418,421.70 = 79,320.60 : x
  2. Step 2: Convert to fraction form
    278,969.40/418,421.70 = 79,320.60/x
  3. Step 3: Cross multiply
    278,969.40x = 418,421.70 × 79,320.60
  4. Step 4: Simplify right side
    278,969.40x = 33,189,460,297.02
  5. Step 5: Solve for x
    x = 33,189,460,297.02/278,969.40
  6. Step 6: Final answer
    x = 118,971.69

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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.