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Finding the Fourth Proportional to 156,430.16, 234,715 and 72,145

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Solution

The fourth proportional to 156,430.16, 234,715 and 72,145 is: 108,249.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,430.16 : 234,715 = 72,145 : x
  2. Step 2: Convert to fraction form
    156,430.16/234,715 = 72,145/x
  3. Step 3: Cross multiply
    156,430.16x = 234,715 × 72,145
  4. Step 4: Simplify right side
    156,430.16x = 16,933,513,675
  5. Step 5: Solve for x
    x = 16,933,513,675/156,430.16
  6. Step 6: Final answer
    x = 108,249.67

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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.