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Finding the Fourth Proportional to 426,875.18, 640,349.13 and 127,336.46

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Solution

The fourth proportional to 426,875.18, 640,349.13 and 127,336.46 is: 191,015.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,875.18 : 640,349.13 = 127,336.46 : x
  2. Step 2: Convert to fraction form
    426,875.18/640,349.13 = 127,336.46/x
  3. Step 3: Cross multiply
    426,875.18x = 640,349.13 × 127,336.46
  4. Step 4: Simplify right side
    426,875.18x = 81,539,791,378.28
  5. Step 5: Solve for x
    x = 81,539,791,378.28/426,875.18
  6. Step 6: Final answer
    x = 191,015.54

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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.