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Finding the Fourth Proportional to 98,920.42, 148,528.86 and 85,634.39

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Solution

The fourth proportional to 98,920.42, 148,528.86 and 85,634.39 is: 128,579.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,920.42 : 148,528.86 = 85,634.39 : x
  2. Step 2: Convert to fraction form
    98,920.42/148,528.86 = 85,634.39/x
  3. Step 3: Cross multiply
    98,920.42x = 148,528.86 × 85,634.39
  4. Step 4: Simplify right side
    98,920.42x = 12,719,178,323.50
  5. Step 5: Solve for x
    x = 12,719,178,323.50/98,920.42
  6. Step 6: Final answer
    x = 128,579.91

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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.