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Finding the Fourth Proportional to 191,909.40, 287,777.70 and 86,674.20

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Solution

The fourth proportional to 191,909.40, 287,777.70 and 86,674.20 is: 129,972.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,909.40 : 287,777.70 = 86,674.20 : x
  2. Step 2: Convert to fraction form
    191,909.40/287,777.70 = 86,674.20/x
  3. Step 3: Cross multiply
    191,909.40x = 287,777.70 × 86,674.20
  4. Step 4: Simplify right side
    191,909.40x = 24,942,901,925.34
  5. Step 5: Solve for x
    x = 24,942,901,925.34/191,909.40
  6. Step 6: Final answer
    x = 129,972.28

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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.