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Finding the Fourth Proportional to 642,135.40, 886,144.66 and 355,655.41

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Solution

The fourth proportional to 642,135.40, 886,144.66 and 355,655.41 is: 490,803.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,135.40 : 886,144.66 = 355,655.41 : x
  2. Step 2: Convert to fraction form
    642,135.40/886,144.66 = 355,655.41/x
  3. Step 3: Cross multiply
    642,135.40x = 886,144.66 × 355,655.41
  4. Step 4: Simplify right side
    642,135.40x = 315,162,139,267.11
  5. Step 5: Solve for x
    x = 315,162,139,267.11/642,135.40
  6. Step 6: Final answer
    x = 490,803.25

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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.