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Finding the Fourth Proportional to 415,809.60, 620,448.40 and 390,418.40

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Solution

The fourth proportional to 415,809.60, 620,448.40 and 390,418.40 is: 582,561.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,809.60 : 620,448.40 = 390,418.40 : x
  2. Step 2: Convert to fraction form
    415,809.60/620,448.40 = 390,418.40/x
  3. Step 3: Cross multiply
    415,809.60x = 620,448.40 × 390,418.40
  4. Step 4: Simplify right side
    415,809.60x = 242,234,471,610.56
  5. Step 5: Solve for x
    x = 242,234,471,610.56/415,809.60
  6. Step 6: Final answer
    x = 582,561.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.