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Finding the Fourth Proportional to 853,000.80, 1,278,886.80 and 479,138.40

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Solution

The fourth proportional to 853,000.80, 1,278,886.80 and 479,138.40 is: 718,362.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    853,000.80 : 1,278,886.80 = 479,138.40 : x
  2. Step 2: Convert to fraction form
    853,000.80/1,278,886.80 = 479,138.40/x
  3. Step 3: Cross multiply
    853,000.80x = 1,278,886.80 × 479,138.40
  4. Step 4: Simplify right side
    853,000.80x = 612,763,775,133.12
  5. Step 5: Solve for x
    x = 612,763,775,133.12/853,000.80
  6. Step 6: Final answer
    x = 718,362.49

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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.