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Finding the Fourth Proportional to 98,642.70, 136,124.16 and 55,621.80

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Solution

The fourth proportional to 98,642.70, 136,124.16 and 55,621.80 is: 76,756.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,642.70 : 136,124.16 = 55,621.80 : x
  2. Step 2: Convert to fraction form
    98,642.70/136,124.16 = 55,621.80/x
  3. Step 3: Cross multiply
    98,642.70x = 136,124.16 × 55,621.80
  4. Step 4: Simplify right side
    98,642.70x = 7,571,470,802.69
  5. Step 5: Solve for x
    x = 7,571,470,802.69/98,642.70
  6. Step 6: Final answer
    x = 76,756.52

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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.