Home / 639,120.42-881,828.91-390,699.66

Finding the Fourth Proportional to 639,120.42, 881,828.91 and 390,699.66

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Solution

The fourth proportional to 639,120.42, 881,828.91 and 390,699.66 is: 539,069.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,120.42 : 881,828.91 = 390,699.66 : x
  2. Step 2: Convert to fraction form
    639,120.42/881,828.91 = 390,699.66/x
  3. Step 3: Cross multiply
    639,120.42x = 881,828.91 × 390,699.66
  4. Step 4: Simplify right side
    639,120.42x = 344,530,255,315.17
  5. Step 5: Solve for x
    x = 344,530,255,315.17/639,120.42
  6. Step 6: Final answer
    x = 539,069.39

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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.