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Finding the Fourth Proportional to 660,205.80, 990,308.70 and 260,640.90

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Solution

The fourth proportional to 660,205.80, 990,308.70 and 260,640.90 is: 390,961.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,205.80 : 990,308.70 = 260,640.90 : x
  2. Step 2: Convert to fraction form
    660,205.80/990,308.70 = 260,640.90/x
  3. Step 3: Cross multiply
    660,205.80x = 990,308.70 × 260,640.90
  4. Step 4: Simplify right side
    660,205.80x = 258,114,950,845.83
  5. Step 5: Solve for x
    x = 258,114,950,845.83/660,205.80
  6. Step 6: Final answer
    x = 390,961.35

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Similar ratio
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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.