Home / 712,120.21-982,749.11-389,830.32

Finding the Fourth Proportional to 712,120.21, 982,749.11 and 389,830.32

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Solution

The fourth proportional to 712,120.21, 982,749.11 and 389,830.32 is: 537,978.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,120.21 : 982,749.11 = 389,830.32 : x
  2. Step 2: Convert to fraction form
    712,120.21/982,749.11 = 389,830.32/x
  3. Step 3: Cross multiply
    712,120.21x = 982,749.11 × 389,830.32
  4. Step 4: Simplify right side
    712,120.21x = 383,105,398,081.86
  5. Step 5: Solve for x
    x = 383,105,398,081.86/712,120.21
  6. Step 6: Final answer
    x = 537,978.55

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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.