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Finding the Fourth Proportional to 390,343.72, 585,515.58 and 94,855.72

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Solution

The fourth proportional to 390,343.72, 585,515.58 and 94,855.72 is: 142,283.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,343.72 : 585,515.58 = 94,855.72 : x
  2. Step 2: Convert to fraction form
    390,343.72/585,515.58 = 94,855.72/x
  3. Step 3: Cross multiply
    390,343.72x = 585,515.58 × 94,855.72
  4. Step 4: Simplify right side
    390,343.72x = 55,539,501,912.12
  5. Step 5: Solve for x
    x = 55,539,501,912.12/390,343.72
  6. Step 6: Final answer
    x = 142,283.58

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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.