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Finding the Fourth Proportional to 426,675.47, 640,013.00 and 127,148.40

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Solution

The fourth proportional to 426,675.47, 640,013.00 and 127,148.40 is: 190,722.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,675.47 : 640,013.00 = 127,148.40 : x
  2. Step 2: Convert to fraction form
    426,675.47/640,013.00 = 127,148.40/x
  3. Step 3: Cross multiply
    426,675.47x = 640,013.00 × 127,148.40
  4. Step 4: Simplify right side
    426,675.47x = 81,376,628,293.46
  5. Step 5: Solve for x
    x = 81,376,628,293.46/426,675.47
  6. Step 6: Final answer
    x = 190,722.54

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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.