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Finding the Fourth Proportional to 662,905.81, 914,780.51 and 387,289.21

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Solution

The fourth proportional to 662,905.81, 914,780.51 and 387,289.21 is: 534,441.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,905.81 : 914,780.51 = 387,289.21 : x
  2. Step 2: Convert to fraction form
    662,905.81/914,780.51 = 387,289.21/x
  3. Step 3: Cross multiply
    662,905.81x = 914,780.51 × 387,289.21
  4. Step 4: Simplify right side
    662,905.81x = 354,284,621,041.30
  5. Step 5: Solve for x
    x = 354,284,621,041.30/662,905.81
  6. Step 6: Final answer
    x = 534,441.87

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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.