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Finding the Fourth Proportional to 660,587.80, 990,881.70 and 394,211.20

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Solution

The fourth proportional to 660,587.80, 990,881.70 and 394,211.20 is: 591,316.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,587.80 : 990,881.70 = 394,211.20 : x
  2. Step 2: Convert to fraction form
    660,587.80/990,881.70 = 394,211.20/x
  3. Step 3: Cross multiply
    660,587.80x = 990,881.70 × 394,211.20
  4. Step 4: Simplify right side
    660,587.80x = 390,616,664,015.04
  5. Step 5: Solve for x
    x = 390,616,664,015.04/660,587.80
  6. Step 6: Final answer
    x = 591,316.80

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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.