Home / 638,445.90-881,099.08-390,194.56

Finding the Fourth Proportional to 638,445.90, 881,099.08 and 390,194.56

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Solution

The fourth proportional to 638,445.90, 881,099.08 and 390,194.56 is: 538,495.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,445.90 : 881,099.08 = 390,194.56 : x
  2. Step 2: Convert to fraction form
    638,445.90/881,099.08 = 390,194.56/x
  3. Step 3: Cross multiply
    638,445.90x = 881,099.08 × 390,194.56
  4. Step 4: Simplify right side
    638,445.90x = 343,800,067,837.01
  5. Step 5: Solve for x
    x = 343,800,067,837.01/638,445.90
  6. Step 6: Final answer
    x = 538,495.22

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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.