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Finding the Fourth Proportional to 438,427.60, 657,641.40 and 399,720.40

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Solution

The fourth proportional to 438,427.60, 657,641.40 and 399,720.40 is: 599,580.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,427.60 : 657,641.40 = 399,720.40 : x
  2. Step 2: Convert to fraction form
    438,427.60/657,641.40 = 399,720.40/x
  3. Step 3: Cross multiply
    438,427.60x = 657,641.40 × 399,720.40
  4. Step 4: Simplify right side
    438,427.60x = 262,872,683,464.56
  5. Step 5: Solve for x
    x = 262,872,683,464.56/438,427.60
  6. Step 6: Final answer
    x = 599,580.60

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1.5x scale

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.