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Finding the Fourth Proportional to 458,003.60, 687,005.40 and 339,905.60

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Solution

The fourth proportional to 458,003.60, 687,005.40 and 339,905.60 is: 509,858.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,003.60 : 687,005.40 = 339,905.60 : x
  2. Step 2: Convert to fraction form
    458,003.60/687,005.40 = 339,905.60/x
  3. Step 3: Cross multiply
    458,003.60x = 687,005.40 × 339,905.60
  4. Step 4: Simplify right side
    458,003.60x = 233,516,982,690.24
  5. Step 5: Solve for x
    x = 233,516,982,690.24/458,003.60
  6. Step 6: Final answer
    x = 509,858.40

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Double scale
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Similar ratio
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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.