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Finding the Fourth Proportional to 426,275.40, 638,570.70 and 276,619.80

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Solution

The fourth proportional to 426,275.40, 638,570.70 and 276,619.80 is: 414,383.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,275.40 : 638,570.70 = 276,619.80 : x
  2. Step 2: Convert to fraction form
    426,275.40/638,570.70 = 276,619.80/x
  3. Step 3: Cross multiply
    426,275.40x = 638,570.70 × 276,619.80
  4. Step 4: Simplify right side
    426,275.40x = 176,641,299,319.86
  5. Step 5: Solve for x
    x = 176,641,299,319.86/426,275.40
  6. Step 6: Final answer
    x = 414,383.05

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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.