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Finding the Fourth Proportional to 308,831.40, 426,185.28 and 172,877.76

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Solution

The fourth proportional to 308,831.40, 426,185.28 and 172,877.76 is: 238,570.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,831.40 : 426,185.28 = 172,877.76 : x
  2. Step 2: Convert to fraction form
    308,831.40/426,185.28 = 172,877.76/x
  3. Step 3: Cross multiply
    308,831.40x = 426,185.28 × 172,877.76
  4. Step 4: Simplify right side
    308,831.40x = 73,677,956,551.37
  5. Step 5: Solve for x
    x = 73,677,956,551.37/308,831.40
  6. Step 6: Final answer
    x = 238,570.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.