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Finding the Fourth Proportional to 191,491.40, 287,366.70 and 86,256.20

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Solution

The fourth proportional to 191,491.40, 287,366.70 and 86,256.20 is: 129,442.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,491.40 : 287,366.70 = 86,256.20 : x
  2. Step 2: Convert to fraction form
    191,491.40/287,366.70 = 86,256.20/x
  3. Step 3: Cross multiply
    191,491.40x = 287,366.70 × 86,256.20
  4. Step 4: Simplify right side
    191,491.40x = 24,787,159,548.54
  5. Step 5: Solve for x
    x = 24,787,159,548.54/191,491.40
  6. Step 6: Final answer
    x = 129,442.68

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1.5x scale

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.