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Finding the Fourth Proportional to 642,378.74, 962,516.93 and 388,890.90

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Solution

The fourth proportional to 642,378.74, 962,516.93 and 388,890.90 is: 582,699.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,378.74 : 962,516.93 = 388,890.90 : x
  2. Step 2: Convert to fraction form
    642,378.74/962,516.93 = 388,890.90/x
  3. Step 3: Cross multiply
    642,378.74x = 962,516.93 × 388,890.90
  4. Step 4: Simplify right side
    642,378.74x = 374,314,073,228.48
  5. Step 5: Solve for x
    x = 374,314,073,228.48/642,378.74
  6. Step 6: Final answer
    x = 582,699.98

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1.5x scale

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.