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Finding the Fourth Proportional to 390,125.64, 585,128.70 and 123,851.64

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Solution

The fourth proportional to 390,125.64, 585,128.70 and 123,851.64 is: 185,758.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,125.64 : 585,128.70 = 123,851.64 : x
  2. Step 2: Convert to fraction form
    390,125.64/585,128.70 = 123,851.64/x
  3. Step 3: Cross multiply
    390,125.64x = 585,128.70 × 123,851.64
  4. Step 4: Simplify right side
    390,125.64x = 72,469,149,106.07
  5. Step 5: Solve for x
    x = 72,469,149,106.07/390,125.64
  6. Step 6: Final answer
    x = 185,758.49

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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.