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Finding the Fourth Proportional to 153,128.32, 229,709.76 and 70,000

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Solution

The fourth proportional to 153,128.32, 229,709.76 and 70,000 is: 105,007.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,128.32 : 229,709.76 = 70,000 : x
  2. Step 2: Convert to fraction form
    153,128.32/229,709.76 = 70,000/x
  3. Step 3: Cross multiply
    153,128.32x = 229,709.76 × 70,000
  4. Step 4: Simplify right side
    153,128.32x = 16,079,683,200
  5. Step 5: Solve for x
    x = 16,079,683,200/153,128.32
  6. Step 6: Final answer
    x = 105,007.90

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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.