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Finding the Fourth Proportional to 210,712.80, 315,627.60 and 98,488.80

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Solution

The fourth proportional to 210,712.80, 315,627.60 and 98,488.80 is: 147,526.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,712.80 : 315,627.60 = 98,488.80 : x
  2. Step 2: Convert to fraction form
    210,712.80/315,627.60 = 98,488.80/x
  3. Step 3: Cross multiply
    210,712.80x = 315,627.60 × 98,488.80
  4. Step 4: Simplify right side
    210,712.80x = 31,085,783,570.88
  5. Step 5: Solve for x
    x = 31,085,783,570.88/210,712.80
  6. Step 6: Final answer
    x = 147,526.79

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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.