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Finding the Fourth Proportional to 1,319,911.20, 1,978,117.20 and 1,169,445.60

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Solution

The fourth proportional to 1,319,911.20, 1,978,117.20 and 1,169,445.60 is: 1,752,618.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,911.20 : 1,978,117.20 = 1,169,445.60 : x
  2. Step 2: Convert to fraction form
    1,319,911.20/1,978,117.20 = 1,169,445.60/x
  3. Step 3: Cross multiply
    1,319,911.20x = 1,978,117.20 × 1,169,445.60
  4. Step 4: Simplify right side
    1,319,911.20x = 2,313,300,455,824.32
  5. Step 5: Solve for x
    x = 2,313,300,455,824.32/1,319,911.20
  6. Step 6: Final answer
    x = 1,752,618.25

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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.