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Finding the Fourth Proportional to 438,435.10, 657,652.65 and 420,939.10

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Solution

The fourth proportional to 438,435.10, 657,652.65 and 420,939.10 is: 631,408.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,435.10 : 657,652.65 = 420,939.10 : x
  2. Step 2: Convert to fraction form
    438,435.10/657,652.65 = 420,939.10/x
  3. Step 3: Cross multiply
    438,435.10x = 657,652.65 × 420,939.10
  4. Step 4: Simplify right side
    438,435.10x = 276,831,714,603.62
  5. Step 5: Solve for x
    x = 276,831,714,603.62/438,435.10
  6. Step 6: Final answer
    x = 631,408.65

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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.