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Finding the Fourth Proportional to 660,279.60, 990,419.40 and 394,340.40

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Solution

The fourth proportional to 660,279.60, 990,419.40 and 394,340.40 is: 591,510.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,279.60 : 990,419.40 = 394,340.40 : x
  2. Step 2: Convert to fraction form
    660,279.60/990,419.40 = 394,340.40/x
  3. Step 3: Cross multiply
    660,279.60x = 990,419.40 × 394,340.40
  4. Step 4: Simplify right side
    660,279.60x = 390,562,382,363.76
  5. Step 5: Solve for x
    x = 390,562,382,363.76/660,279.60
  6. Step 6: Final answer
    x = 591,510.60

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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.