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Finding the Fourth Proportional to 191,790.72, 287,783.28 and 129,330

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Solution

The fourth proportional to 191,790.72, 287,783.28 and 129,330 is: 194,060.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,790.72 : 287,783.28 = 129,330 : x
  2. Step 2: Convert to fraction form
    191,790.72/287,783.28 = 129,330/x
  3. Step 3: Cross multiply
    191,790.72x = 287,783.28 × 129,330
  4. Step 4: Simplify right side
    191,790.72x = 37,219,011,602.40
  5. Step 5: Solve for x
    x = 37,219,011,602.40/191,790.72
  6. Step 6: Final answer
    x = 194,060.54

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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.