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Finding the Fourth Proportional to 657,638.19, 986,485.95 and 208,392.21

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Solution

The fourth proportional to 657,638.19, 986,485.95 and 208,392.21 is: 312,597.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,638.19 : 986,485.95 = 208,392.21 : x
  2. Step 2: Convert to fraction form
    657,638.19/986,485.95 = 208,392.21/x
  3. Step 3: Cross multiply
    657,638.19x = 986,485.95 × 208,392.21
  4. Step 4: Simplify right side
    657,638.19x = 205,575,987,254.45
  5. Step 5: Solve for x
    x = 205,575,987,254.45/657,638.19
  6. Step 6: Final answer
    x = 312,597.40

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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.