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Finding the Fourth Proportional to 642,402.40, 962,566.80 and 405,320.80

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Solution

The fourth proportional to 642,402.40, 962,566.80 and 405,320.80 is: 607,327.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,402.40 : 962,566.80 = 405,320.80 : x
  2. Step 2: Convert to fraction form
    642,402.40/962,566.80 = 405,320.80/x
  3. Step 3: Cross multiply
    642,402.40x = 962,566.80 × 405,320.80
  4. Step 4: Simplify right side
    642,402.40x = 390,148,345,429.44
  5. Step 5: Solve for x
    x = 390,148,345,429.44/642,402.40
  6. Step 6: Final answer
    x = 607,327.04

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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.