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Finding the Fourth Proportional to 138,570.40, 207,336.60 and 98,681.60

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Solution

The fourth proportional to 138,570.40, 207,336.60 and 98,681.60 is: 147,652.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,570.40 : 207,336.60 = 98,681.60 : x
  2. Step 2: Convert to fraction form
    138,570.40/207,336.60 = 98,681.60/x
  3. Step 3: Cross multiply
    138,570.40x = 207,336.60 × 98,681.60
  4. Step 4: Simplify right side
    138,570.40x = 20,460,307,426.56
  5. Step 5: Solve for x
    x = 20,460,307,426.56/138,570.40
  6. Step 6: Final answer
    x = 147,652.80

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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.