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Finding the Fourth Proportional to 101,385.66, 139,865.70 and 65,587.21

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Solution

The fourth proportional to 101,385.66, 139,865.70 and 65,587.21 is: 90,480.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,385.66 : 139,865.70 = 65,587.21 : x
  2. Step 2: Convert to fraction form
    101,385.66/139,865.70 = 65,587.21/x
  3. Step 3: Cross multiply
    101,385.66x = 139,865.70 × 65,587.21
  4. Step 4: Simplify right side
    101,385.66x = 9,173,401,037.70
  5. Step 5: Solve for x
    x = 9,173,401,037.70/101,385.66
  6. Step 6: Final answer
    x = 90,480.27

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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.