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Finding the Fourth Proportional to 98,908.70, 136,518.44 and 56,491.83

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Solution

The fourth proportional to 98,908.70, 136,518.44 and 56,491.83 is: 77,972.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,908.70 : 136,518.44 = 56,491.83 : x
  2. Step 2: Convert to fraction form
    98,908.70/136,518.44 = 56,491.83/x
  3. Step 3: Cross multiply
    98,908.70x = 136,518.44 × 56,491.83
  4. Step 4: Simplify right side
    98,908.70x = 7,712,176,221.89
  5. Step 5: Solve for x
    x = 7,712,176,221.89/98,908.70
  6. Step 6: Final answer
    x = 77,972.68

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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.