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Finding the Fourth Proportional to 287,655.47, 431,631.09 and 220,618.17

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Solution

The fourth proportional to 287,655.47, 431,631.09 and 220,618.17 is: 331,040.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,655.47 : 431,631.09 = 220,618.17 : x
  2. Step 2: Convert to fraction form
    287,655.47/431,631.09 = 220,618.17/x
  3. Step 3: Cross multiply
    287,655.47x = 431,631.09 × 220,618.17
  4. Step 4: Simplify right side
    287,655.47x = 95,225,659,356.45
  5. Step 5: Solve for x
    x = 95,225,659,356.45/287,655.47
  6. Step 6: Final answer
    x = 331,040.67

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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.