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Finding the Fourth Proportional to 287,421.80, 431,132.70 and 259,428.20

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Solution

The fourth proportional to 287,421.80, 431,132.70 and 259,428.20 is: 389,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,421.80 : 431,132.70 = 259,428.20 : x
  2. Step 2: Convert to fraction form
    287,421.80/431,132.70 = 259,428.20/x
  3. Step 3: Cross multiply
    287,421.80x = 431,132.70 × 259,428.20
  4. Step 4: Simplify right side
    287,421.80x = 111,847,980,322.14
  5. Step 5: Solve for x
    x = 111,847,980,322.14/287,421.80
  6. Step 6: Final answer
    x = 389,142.30

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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.