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Finding the Fourth Proportional to 426,991.76, 640,579.12 and 127,495.92

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Solution

The fourth proportional to 426,991.76, 640,579.12 and 127,495.92 is: 191,271.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,991.76 : 640,579.12 = 127,495.92 : x
  2. Step 2: Convert to fraction form
    426,991.76/640,579.12 = 127,495.92/x
  3. Step 3: Cross multiply
    426,991.76x = 640,579.12 × 127,495.92
  4. Step 4: Simplify right side
    426,991.76x = 81,671,224,237.19
  5. Step 5: Solve for x
    x = 81,671,224,237.19/426,991.76
  6. Step 6: Final answer
    x = 191,271.20

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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.