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Finding the Fourth Proportional to 426,615.49, 640,061.58 and 127,098.64

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Solution

The fourth proportional to 426,615.49, 640,061.58 and 127,098.64 is: 190,689.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,615.49 : 640,061.58 = 127,098.64 : x
  2. Step 2: Convert to fraction form
    426,615.49/640,061.58 = 127,098.64/x
  3. Step 3: Cross multiply
    426,615.49x = 640,061.58 × 127,098.64
  4. Step 4: Simplify right side
    426,615.49x = 81,350,956,334.25
  5. Step 5: Solve for x
    x = 81,350,956,334.25/426,615.49
  6. Step 6: Final answer
    x = 190,689.18

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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.