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Finding the Fourth Proportional to 712,489.50, 983,184.12 and 390,147.48

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Solution

The fourth proportional to 712,489.50, 983,184.12 and 390,147.48 is: 538,375.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,489.50 : 983,184.12 = 390,147.48 : x
  2. Step 2: Convert to fraction form
    712,489.50/983,184.12 = 390,147.48/x
  3. Step 3: Cross multiply
    712,489.50x = 983,184.12 × 390,147.48
  4. Step 4: Simplify right side
    712,489.50x = 383,586,806,794.02
  5. Step 5: Solve for x
    x = 383,586,806,794.02/712,489.50
  6. Step 6: Final answer
    x = 538,375.38

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1.5x scale

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.