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Finding the Fourth Proportional to 191,812.30, 287,718.45 and 86,836.30

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Solution

The fourth proportional to 191,812.30, 287,718.45 and 86,836.30 is: 130,254.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,812.30 : 287,718.45 = 86,836.30 : x
  2. Step 2: Convert to fraction form
    191,812.30/287,718.45 = 86,836.30/x
  3. Step 3: Cross multiply
    191,812.30x = 287,718.45 × 86,836.30
  4. Step 4: Simplify right side
    191,812.30x = 24,984,405,639.74
  5. Step 5: Solve for x
    x = 24,984,405,639.74/191,812.30
  6. Step 6: Final answer
    x = 130,254.45

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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.