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Finding the Fourth Proportional to 615,578.40, 921,812.40 and 404,071.20

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Solution

The fourth proportional to 615,578.40, 921,812.40 and 404,071.20 is: 605,085.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,578.40 : 921,812.40 = 404,071.20 : x
  2. Step 2: Convert to fraction form
    615,578.40/921,812.40 = 404,071.20/x
  3. Step 3: Cross multiply
    615,578.40x = 921,812.40 × 404,071.20
  4. Step 4: Simplify right side
    615,578.40x = 372,477,842,642.88
  5. Step 5: Solve for x
    x = 372,477,842,642.88/615,578.40
  6. Step 6: Final answer
    x = 605,085.95

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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.