Home / 638,442.90-881,094.93-390,191.55

Finding the Fourth Proportional to 638,442.90, 881,094.93 and 390,191.55

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Solution

The fourth proportional to 638,442.90, 881,094.93 and 390,191.55 is: 538,491.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,442.90 : 881,094.93 = 390,191.55 : x
  2. Step 2: Convert to fraction form
    638,442.90/881,094.93 = 390,191.55/x
  3. Step 3: Cross multiply
    638,442.90x = 881,094.93 × 390,191.55
  4. Step 4: Simplify right side
    638,442.90x = 343,795,796,433.84
  5. Step 5: Solve for x
    x = 343,795,796,433.84/638,442.90
  6. Step 6: Final answer
    x = 538,491.06

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Double scale
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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.