Home / 156,509.47-234,239.32-128,428.39

Finding the Fourth Proportional to 156,509.47, 234,239.32 and 128,428.39

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Solution

The fourth proportional to 156,509.47, 234,239.32 and 128,428.39 is: 192,211.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,509.47 : 234,239.32 = 128,428.39 : x
  2. Step 2: Convert to fraction form
    156,509.47/234,239.32 = 128,428.39/x
  3. Step 3: Cross multiply
    156,509.47x = 234,239.32 × 128,428.39
  4. Step 4: Simplify right side
    156,509.47x = 30,082,978,742.29
  5. Step 5: Solve for x
    x = 30,082,978,742.29/156,509.47
  6. Step 6: Final answer
    x = 192,211.88

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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.