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Finding the Fourth Proportional to 245,421.80, 368,132.70 and 217,428.20

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Solution

The fourth proportional to 245,421.80, 368,132.70 and 217,428.20 is: 326,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,421.80 : 368,132.70 = 217,428.20 : x
  2. Step 2: Convert to fraction form
    245,421.80/368,132.70 = 217,428.20/x
  3. Step 3: Cross multiply
    245,421.80x = 368,132.70 × 217,428.20
  4. Step 4: Simplify right side
    245,421.80x = 80,042,430,322.14
  5. Step 5: Solve for x
    x = 80,042,430,322.14/245,421.80
  6. Step 6: Final answer
    x = 326,142.30

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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.