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Finding the Fourth Proportional to 659,428.97, 989,132.65 and 210,143.84

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Solution

The fourth proportional to 659,428.97, 989,132.65 and 210,143.84 is: 315,212.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,428.97 : 989,132.65 = 210,143.84 : x
  2. Step 2: Convert to fraction form
    659,428.97/989,132.65 = 210,143.84/x
  3. Step 3: Cross multiply
    659,428.97x = 989,132.65 × 210,143.84
  4. Step 4: Simplify right side
    659,428.97x = 207,860,127,869.35
  5. Step 5: Solve for x
    x = 207,860,127,869.35/659,428.97
  6. Step 6: Final answer
    x = 315,212.31

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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.