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Finding the Fourth Proportional to 660,560.71, 911,575.53 and 388,638.85

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Solution

The fourth proportional to 660,560.71, 911,575.53 and 388,638.85 is: 536,322.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,560.71 : 911,575.53 = 388,638.85 : x
  2. Step 2: Convert to fraction form
    660,560.71/911,575.53 = 388,638.85/x
  3. Step 3: Cross multiply
    660,560.71x = 911,575.53 × 388,638.85
  4. Step 4: Simplify right side
    660,560.71x = 354,273,659,166.27
  5. Step 5: Solve for x
    x = 354,273,659,166.27/660,560.71
  6. Step 6: Final answer
    x = 536,322.64

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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.