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Finding the Fourth Proportional to 642,352.55, 886,411.61 and 355,855.55

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Solution

The fourth proportional to 642,352.55, 886,411.61 and 355,855.55 is: 491,061.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,352.55 : 886,411.61 = 355,855.55 : x
  2. Step 2: Convert to fraction form
    642,352.55/886,411.61 = 355,855.55/x
  3. Step 3: Cross multiply
    642,352.55x = 886,411.61 × 355,855.55
  4. Step 4: Simplify right side
    642,352.55x = 315,434,491,002.94
  5. Step 5: Solve for x
    x = 315,434,491,002.94/642,352.55
  6. Step 6: Final answer
    x = 491,061.32

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1.5x scale

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.