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Finding the Fourth Proportional to 118,731.50, 163,849.47 and 65,739.50

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Solution

The fourth proportional to 118,731.50, 163,849.47 and 65,739.50 is: 90,720.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,731.50 : 163,849.47 = 65,739.50 : x
  2. Step 2: Convert to fraction form
    118,731.50/163,849.47 = 65,739.50/x
  3. Step 3: Cross multiply
    118,731.50x = 163,849.47 × 65,739.50
  4. Step 4: Simplify right side
    118,731.50x = 10,771,382,233.07
  5. Step 5: Solve for x
    x = 10,771,382,233.07/118,731.50
  6. Step 6: Final answer
    x = 90,720.51

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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.