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Finding the Fourth Proportional to 642,639.64, 886,842.78 and 356,178.22

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Solution

The fourth proportional to 642,639.64, 886,842.78 and 356,178.22 is: 491,525.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,639.64 : 886,842.78 = 356,178.22 : x
  2. Step 2: Convert to fraction form
    642,639.64/886,842.78 = 356,178.22/x
  3. Step 3: Cross multiply
    642,639.64x = 886,842.78 × 356,178.22
  4. Step 4: Simplify right side
    642,639.64x = 315,874,081,918.81
  5. Step 5: Solve for x
    x = 315,874,081,918.81/642,639.64
  6. Step 6: Final answer
    x = 491,525.99

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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.