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Finding the Fourth Proportional to 403,407.60, 605,111.40 and 393,039.60

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Solution

The fourth proportional to 403,407.60, 605,111.40 and 393,039.60 is: 589,559.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,407.60 : 605,111.40 = 393,039.60 : x
  2. Step 2: Convert to fraction form
    403,407.60/605,111.40 = 393,039.60/x
  3. Step 3: Cross multiply
    403,407.60x = 605,111.40 × 393,039.60
  4. Step 4: Simplify right side
    403,407.60x = 237,832,742,611.44
  5. Step 5: Solve for x
    x = 237,832,742,611.44/403,407.60
  6. Step 6: Final answer
    x = 589,559.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.