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Finding the Fourth Proportional to 99,276, 136,997.79 and 56,831.70

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Solution

The fourth proportional to 99,276, 136,997.79 and 56,831.70 is: 78,425.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,276 : 136,997.79 = 56,831.70 : x
  2. Step 2: Convert to fraction form
    99,276/136,997.79 = 56,831.70/x
  3. Step 3: Cross multiply
    99,276x = 136,997.79 × 56,831.70
  4. Step 4: Simplify right side
    99,276x = 7,785,817,301.94
  5. Step 5: Solve for x
    x = 7,785,817,301.94/99,276
  6. Step 6: Final answer
    x = 78,425.98

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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.