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Finding the Fourth Proportional to 666,486.16, 919,860.88 and 408,506.61

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Solution

The fourth proportional to 666,486.16, 919,860.88 and 408,506.61 is: 563,806.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,486.16 : 919,860.88 = 408,506.61 : x
  2. Step 2: Convert to fraction form
    666,486.16/919,860.88 = 408,506.61/x
  3. Step 3: Cross multiply
    666,486.16x = 919,860.88 × 408,506.61
  4. Step 4: Simplify right side
    666,486.16x = 375,769,245,289.67
  5. Step 5: Solve for x
    x = 375,769,245,289.67/666,486.16
  6. Step 6: Final answer
    x = 563,806.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.