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Finding the Fourth Proportional to 642,352.80, 886,411.95 and 355,855.80

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Solution

The fourth proportional to 642,352.80, 886,411.95 and 355,855.80 is: 491,061.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,352.80 : 886,411.95 = 355,855.80 : x
  2. Step 2: Convert to fraction form
    642,352.80/886,411.95 = 355,855.80/x
  3. Step 3: Cross multiply
    642,352.80x = 886,411.95 × 355,855.80
  4. Step 4: Simplify right side
    642,352.80x = 315,434,833,596.81
  5. Step 5: Solve for x
    x = 315,434,833,596.81/642,352.80
  6. Step 6: Final answer
    x = 491,061.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.