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Finding the Fourth Proportional to 687,790.50, 949,238.40 and 385,984.50

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Solution

The fourth proportional to 687,790.50, 949,238.40 and 385,984.50 is: 532,707.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,790.50 : 949,238.40 = 385,984.50 : x
  2. Step 2: Convert to fraction form
    687,790.50/949,238.40 = 385,984.50/x
  3. Step 3: Cross multiply
    687,790.50x = 949,238.40 × 385,984.50
  4. Step 4: Simplify right side
    687,790.50x = 366,391,309,204.80
  5. Step 5: Solve for x
    x = 366,391,309,204.80/687,790.50
  6. Step 6: Final answer
    x = 532,707.72

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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.