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Finding the Fourth Proportional to 143,931.80, 215,832.90 and 65,005.40

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Solution

The fourth proportional to 143,931.80, 215,832.90 and 65,005.40 is: 97,478.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,931.80 : 215,832.90 = 65,005.40 : x
  2. Step 2: Convert to fraction form
    143,931.80/215,832.90 = 65,005.40/x
  3. Step 3: Cross multiply
    143,931.80x = 215,832.90 × 65,005.40
  4. Step 4: Simplify right side
    143,931.80x = 14,030,303,997.66
  5. Step 5: Solve for x
    x = 14,030,303,997.66/143,931.80
  6. Step 6: Final answer
    x = 97,478.83

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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.