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Finding the Fourth Proportional to 432,083.20, 648,124.80 and 390,092.80

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Solution

The fourth proportional to 432,083.20, 648,124.80 and 390,092.80 is: 585,139.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,083.20 : 648,124.80 = 390,092.80 : x
  2. Step 2: Convert to fraction form
    432,083.20/648,124.80 = 390,092.80/x
  3. Step 3: Cross multiply
    432,083.20x = 648,124.80 × 390,092.80
  4. Step 4: Simplify right side
    432,083.20x = 252,828,817,981.44
  5. Step 5: Solve for x
    x = 252,828,817,981.44/432,083.20
  6. Step 6: Final answer
    x = 585,139.20

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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.