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Finding the Fourth Proportional to 70,920, 97,869.60 and 39,089.25

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Solution

The fourth proportional to 70,920, 97,869.60 and 39,089.25 is: 53,943.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,920 : 97,869.60 = 39,089.25 : x
  2. Step 2: Convert to fraction form
    70,920/97,869.60 = 39,089.25/x
  3. Step 3: Cross multiply
    70,920x = 97,869.60 × 39,089.25
  4. Step 4: Simplify right side
    70,920x = 3,825,649,261.80
  5. Step 5: Solve for x
    x = 3,825,649,261.80/70,920
  6. Step 6: Final answer
    x = 53,943.17

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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.