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Finding the Fourth Proportional to 101,421.80, 139,915.52 and 65,623.48

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Solution

The fourth proportional to 101,421.80, 139,915.52 and 65,623.48 is: 90,530.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,421.80 : 139,915.52 = 65,623.48 : x
  2. Step 2: Convert to fraction form
    101,421.80/139,915.52 = 65,623.48/x
  3. Step 3: Cross multiply
    101,421.80x = 139,915.52 × 65,623.48
  4. Step 4: Simplify right side
    101,421.80x = 9,181,743,328.41
  5. Step 5: Solve for x
    x = 9,181,743,328.41/101,421.80
  6. Step 6: Final answer
    x = 90,530.27

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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.