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Finding the Fourth Proportional to 660,560.21, 911,574.83 and 388,638.35

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Solution

The fourth proportional to 660,560.21, 911,574.83 and 388,638.35 is: 536,321.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,560.21 : 911,574.83 = 388,638.35 : x
  2. Step 2: Convert to fraction form
    660,560.21/911,574.83 = 388,638.35/x
  3. Step 3: Cross multiply
    660,560.21x = 911,574.83 × 388,638.35
  4. Step 4: Simplify right side
    660,560.21x = 354,272,934,246.45
  5. Step 5: Solve for x
    x = 354,272,934,246.45/660,560.21
  6. Step 6: Final answer
    x = 536,321.95

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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.