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Finding the Fourth Proportional to 426,853.20, 640,279.80 and 402,358.80

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Solution

The fourth proportional to 426,853.20, 640,279.80 and 402,358.80 is: 603,538.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,853.20 : 640,279.80 = 402,358.80 : x
  2. Step 2: Convert to fraction form
    426,853.20/640,279.80 = 402,358.80/x
  3. Step 3: Cross multiply
    426,853.20x = 640,279.80 × 402,358.80
  4. Step 4: Simplify right side
    426,853.20x = 257,622,211,992.24
  5. Step 5: Solve for x
    x = 257,622,211,992.24/426,853.20
  6. Step 6: Final answer
    x = 603,538.20

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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.