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Finding the Fourth Proportional to 156,555.21, 216,066.54 and 87,670.90

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Solution

The fourth proportional to 156,555.21, 216,066.54 and 87,670.90 is: 120,997.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,555.21 : 216,066.54 = 87,670.90 : x
  2. Step 2: Convert to fraction form
    156,555.21/216,066.54 = 87,670.90/x
  3. Step 3: Cross multiply
    156,555.21x = 216,066.54 × 87,670.90
  4. Step 4: Simplify right side
    156,555.21x = 18,942,748,021.69
  5. Step 5: Solve for x
    x = 18,942,748,021.69/156,555.21
  6. Step 6: Final answer
    x = 120,997.24

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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.