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Finding the Fourth Proportional to 143,649.30, 215,571.15 and 64,722.90

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Solution

The fourth proportional to 143,649.30, 215,571.15 and 64,722.90 is: 97,128.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,649.30 : 215,571.15 = 64,722.90 : x
  2. Step 2: Convert to fraction form
    143,649.30/215,571.15 = 64,722.90/x
  3. Step 3: Cross multiply
    143,649.30x = 215,571.15 × 64,722.90
  4. Step 4: Simplify right side
    143,649.30x = 13,952,389,984.34
  5. Step 5: Solve for x
    x = 13,952,389,984.34/143,649.30
  6. Step 6: Final answer
    x = 97,128.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.