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Finding the Fourth Proportional to 642,495, 886,662.54 and 355,988.28

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Solution

The fourth proportional to 642,495, 886,662.54 and 355,988.28 is: 491,274.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,495 : 886,662.54 = 355,988.28 : x
  2. Step 2: Convert to fraction form
    642,495/886,662.54 = 355,988.28/x
  3. Step 3: Cross multiply
    642,495x = 886,662.54 × 355,988.28
  4. Step 4: Simplify right side
    642,495x = 315,641,472,555.03
  5. Step 5: Solve for x
    x = 315,641,472,555.03/642,495
  6. Step 6: Final answer
    x = 491,274.60

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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.