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Finding the Fourth Proportional to 642,825.50, 887,039.54 and 356,321.22

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Solution

The fourth proportional to 642,825.50, 887,039.54 and 356,321.22 is: 491,690.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,825.50 : 887,039.54 = 356,321.22 : x
  2. Step 2: Convert to fraction form
    642,825.50/887,039.54 = 356,321.22/x
  3. Step 3: Cross multiply
    642,825.50x = 887,039.54 × 356,321.22
  4. Step 4: Simplify right side
    642,825.50x = 316,071,011,081.04
  5. Step 5: Solve for x
    x = 316,071,011,081.04/642,825.50
  6. Step 6: Final answer
    x = 491,690.22

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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.