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Finding the Fourth Proportional to 615,190.40, 922,915.20 and 260,021.60

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Solution

The fourth proportional to 615,190.40, 922,915.20 and 260,021.60 is: 390,087.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,190.40 : 922,915.20 = 260,021.60 : x
  2. Step 2: Convert to fraction form
    615,190.40/922,915.20 = 260,021.60/x
  3. Step 3: Cross multiply
    615,190.40x = 922,915.20 × 260,021.60
  4. Step 4: Simplify right side
    615,190.40x = 239,977,886,968.32
  5. Step 5: Solve for x
    x = 239,977,886,968.32/615,190.40
  6. Step 6: Final answer
    x = 390,087.18

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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.