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Finding the Fourth Proportional to 1,328,749.60, 1,990,748.40 and 808,477.60

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Solution

The fourth proportional to 1,328,749.60, 1,990,748.40 and 808,477.60 is: 1,211,270.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328,749.60 : 1,990,748.40 = 808,477.60 : x
  2. Step 2: Convert to fraction form
    1,328,749.60/1,990,748.40 = 808,477.60/x
  3. Step 3: Cross multiply
    1,328,749.60x = 1,990,748.40 × 808,477.60
  4. Step 4: Simplify right side
    1,328,749.60x = 1,609,475,488,635.84
  5. Step 5: Solve for x
    x = 1,609,475,488,635.84/1,328,749.60
  6. Step 6: Final answer
    x = 1,211,270.72

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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.