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Finding the Fourth Proportional to 660,743.63, 911,748.85 and 388,751.70

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Solution

The fourth proportional to 660,743.63, 911,748.85 and 388,751.70 is: 536,431.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,743.63 : 911,748.85 = 388,751.70 : x
  2. Step 2: Convert to fraction form
    660,743.63/911,748.85 = 388,751.70/x
  3. Step 3: Cross multiply
    660,743.63x = 911,748.85 × 388,751.70
  4. Step 4: Simplify right side
    660,743.63x = 354,443,914,438.67
  5. Step 5: Solve for x
    x = 354,443,914,438.67/660,743.63
  6. Step 6: Final answer
    x = 536,431.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.