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Finding the Fourth Proportional to 78,975.38, 108,915.45 and 65,525.33

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Solution

The fourth proportional to 78,975.38, 108,915.45 and 65,525.33 is: 90,366.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,975.38 : 108,915.45 = 65,525.33 : x
  2. Step 2: Convert to fraction form
    78,975.38/108,915.45 = 65,525.33/x
  3. Step 3: Cross multiply
    78,975.38x = 108,915.45 × 65,525.33
  4. Step 4: Simplify right side
    78,975.38x = 7,136,720,803.35
  5. Step 5: Solve for x
    x = 7,136,720,803.35/78,975.38
  6. Step 6: Final answer
    x = 90,366.40

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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.