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Finding the Fourth Proportional to 415,560.78, 620,079.30 and 390,168.90

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Solution

The fourth proportional to 415,560.78, 620,079.30 and 390,168.90 is: 582,190.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,560.78 : 620,079.30 = 390,168.90 : x
  2. Step 2: Convert to fraction form
    415,560.78/620,079.30 = 390,168.90/x
  3. Step 3: Cross multiply
    415,560.78x = 620,079.30 × 390,168.90
  4. Step 4: Simplify right side
    415,560.78x = 241,935,658,393.77
  5. Step 5: Solve for x
    x = 241,935,658,393.77/415,560.78
  6. Step 6: Final answer
    x = 582,190.79

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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.