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Finding the Fourth Proportional to 389,427.70, 545,986.10 and 389,427.70

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Solution

The fourth proportional to 389,427.70, 545,986.10 and 389,427.70 is: 545,986.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,427.70 : 545,986.10 = 389,427.70 : x
  2. Step 2: Convert to fraction form
    389,427.70/545,986.10 = 389,427.70/x
  3. Step 3: Cross multiply
    389,427.70x = 545,986.10 × 389,427.70
  4. Step 4: Simplify right side
    389,427.70x = 212,622,111,154.97
  5. Step 5: Solve for x
    x = 212,622,111,154.97/389,427.70
  6. Step 6: Final answer
    x = 545,986.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.