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Finding the Fourth Proportional to 659,915.60, 989,873.40 and 423,719.60

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Solution

The fourth proportional to 659,915.60, 989,873.40 and 423,719.60 is: 635,579.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,915.60 : 989,873.40 = 423,719.60 : x
  2. Step 2: Convert to fraction form
    659,915.60/989,873.40 = 423,719.60/x
  3. Step 3: Cross multiply
    659,915.60x = 989,873.40 × 423,719.60
  4. Step 4: Simplify right side
    659,915.60x = 419,428,761,098.64
  5. Step 5: Solve for x
    x = 419,428,761,098.64/659,915.60
  6. Step 6: Final answer
    x = 635,579.40

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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.