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Finding the Fourth Proportional to 287,863.60, 431,665.80 and 130,010.80

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Solution

The fourth proportional to 287,863.60, 431,665.80 and 130,010.80 is: 194,957.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,863.60 : 431,665.80 = 130,010.80 : x
  2. Step 2: Convert to fraction form
    287,863.60/431,665.80 = 130,010.80/x
  3. Step 3: Cross multiply
    287,863.60x = 431,665.80 × 130,010.80
  4. Step 4: Simplify right side
    287,863.60x = 56,121,215,990.64
  5. Step 5: Solve for x
    x = 56,121,215,990.64/287,863.60
  6. Step 6: Final answer
    x = 194,957.67

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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.