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Finding the Fourth Proportional to 98,420.45, 135,750.24 and 65,698.38

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Solution

The fourth proportional to 98,420.45, 135,750.24 and 65,698.38 is: 90,617.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,420.45 : 135,750.24 = 65,698.38 : x
  2. Step 2: Convert to fraction form
    98,420.45/135,750.24 = 65,698.38/x
  3. Step 3: Cross multiply
    98,420.45x = 135,750.24 × 65,698.38
  4. Step 4: Simplify right side
    98,420.45x = 8,918,570,852.61
  5. Step 5: Solve for x
    x = 8,918,570,852.61/98,420.45
  6. Step 6: Final answer
    x = 90,617.05

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1.5x scale

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.