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Finding the Fourth Proportional to 642,312, 886,325.96 and 355,778.55

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Solution

The fourth proportional to 642,312, 886,325.96 and 355,778.55 is: 490,938.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,312 : 886,325.96 = 355,778.55 : x
  2. Step 2: Convert to fraction form
    642,312/886,325.96 = 355,778.55/x
  3. Step 3: Cross multiply
    642,312x = 886,325.96 × 355,778.55
  4. Step 4: Simplify right side
    642,312x = 315,335,764,876.16
  5. Step 5: Solve for x
    x = 315,335,764,876.16/642,312
  6. Step 6: Final answer
    x = 490,938.62

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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.