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Finding the Fourth Proportional to 426,678.84, 640,018.06 and 127,151.78

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Solution

The fourth proportional to 426,678.84, 640,018.06 and 127,151.78 is: 190,727.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,678.84 : 640,018.06 = 127,151.78 : x
  2. Step 2: Convert to fraction form
    426,678.84/640,018.06 = 127,151.78/x
  3. Step 3: Cross multiply
    426,678.84x = 640,018.06 × 127,151.78
  4. Step 4: Simplify right side
    426,678.84x = 81,379,432,043.18
  5. Step 5: Solve for x
    x = 81,379,432,043.18/426,678.84
  6. Step 6: Final answer
    x = 190,727.60

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1.5x scale

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.