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Finding the Fourth Proportional to 287,602.10, 431,399.10 and 129,830.30

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Solution

The fourth proportional to 287,602.10, 431,399.10 and 129,830.30 is: 194,743.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,602.10 : 431,399.10 = 129,830.30 : x
  2. Step 2: Convert to fraction form
    287,602.10/431,399.10 = 129,830.30/x
  3. Step 3: Cross multiply
    287,602.10x = 431,399.10 × 129,830.30
  4. Step 4: Simplify right side
    287,602.10x = 56,008,674,572.73
  5. Step 5: Solve for x
    x = 56,008,674,572.73/287,602.10
  6. Step 6: Final answer
    x = 194,743.62

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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.