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Finding the Fourth Proportional to 71,685.64, 98,920.58 and 39,852.60

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Solution

The fourth proportional to 71,685.64, 98,920.58 and 39,852.60 is: 54,993.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,685.64 : 98,920.58 = 39,852.60 : x
  2. Step 2: Convert to fraction form
    71,685.64/98,920.58 = 39,852.60/x
  3. Step 3: Cross multiply
    71,685.64x = 98,920.58 × 39,852.60
  4. Step 4: Simplify right side
    71,685.64x = 3,942,242,306.51
  5. Step 5: Solve for x
    x = 3,942,242,306.51/71,685.64
  6. Step 6: Final answer
    x = 54,993.47

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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.