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Finding the Fourth Proportional to 680,519.54, 939,007.14 and 390,077.74

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Solution

The fourth proportional to 680,519.54, 939,007.14 and 390,077.74 is: 538,244.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,519.54 : 939,007.14 = 390,077.74 : x
  2. Step 2: Convert to fraction form
    680,519.54/939,007.14 = 390,077.74/x
  3. Step 3: Cross multiply
    680,519.54x = 939,007.14 × 390,077.74
  4. Step 4: Simplify right side
    680,519.54x = 366,285,783,015.06
  5. Step 5: Solve for x
    x = 366,285,783,015.06/680,519.54
  6. Step 6: Final answer
    x = 538,244.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.