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Finding the Fourth Proportional to 389,421.30, 583,147.80 and 310,689.30

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Solution

The fourth proportional to 389,421.30, 583,147.80 and 310,689.30 is: 465,248.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,421.30 : 583,147.80 = 310,689.30 : x
  2. Step 2: Convert to fraction form
    389,421.30/583,147.80 = 310,689.30/x
  3. Step 3: Cross multiply
    389,421.30x = 583,147.80 × 310,689.30
  4. Step 4: Simplify right side
    389,421.30x = 181,177,781,778.54
  5. Step 5: Solve for x
    x = 181,177,781,778.54/389,421.30
  6. Step 6: Final answer
    x = 465,248.77

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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.