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Finding the Fourth Proportional to 691,756.50, 954,638.55 and 389,950.50

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Solution

The fourth proportional to 691,756.50, 954,638.55 and 389,950.50 is: 538,139.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,756.50 : 954,638.55 = 389,950.50 : x
  2. Step 2: Convert to fraction form
    691,756.50/954,638.55 = 389,950.50/x
  3. Step 3: Cross multiply
    691,756.50x = 954,638.55 × 389,950.50
  4. Step 4: Simplify right side
    691,756.50x = 372,261,779,891.78
  5. Step 5: Solve for x
    x = 372,261,779,891.78/691,756.50
  6. Step 6: Final answer
    x = 538,139.91

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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.