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Finding the Fourth Proportional to 642,842.08, 887,106 and 356,361.28

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Solution

The fourth proportional to 642,842.08, 887,106 and 356,361.28 is: 491,769.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,842.08 : 887,106 = 356,361.28 : x
  2. Step 2: Convert to fraction form
    642,842.08/887,106 = 356,361.28/x
  3. Step 3: Cross multiply
    642,842.08x = 887,106 × 356,361.28
  4. Step 4: Simplify right side
    642,842.08x = 316,130,229,655.68
  5. Step 5: Solve for x
    x = 316,130,229,655.68/642,842.08
  6. Step 6: Final answer
    x = 491,769.66

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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.