Home / 681,438.78-939,512.10-558,478.50

Finding the Fourth Proportional to 681,438.78, 939,512.10 and 558,478.50

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Solution

The fourth proportional to 681,438.78, 939,512.10 and 558,478.50 is: 769,984.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    681,438.78 : 939,512.10 = 558,478.50 : x
  2. Step 2: Convert to fraction form
    681,438.78/939,512.10 = 558,478.50/x
  3. Step 3: Cross multiply
    681,438.78x = 939,512.10 × 558,478.50
  4. Step 4: Simplify right side
    681,438.78x = 524,697,308,339.85
  5. Step 5: Solve for x
    x = 524,697,308,339.85/681,438.78
  6. Step 6: Final answer
    x = 769,984.51

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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.