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Finding the Fourth Proportional to 642,646.70, 886,852.53 and 356,185.28

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Solution

The fourth proportional to 642,646.70, 886,852.53 and 356,185.28 is: 491,535.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,646.70 : 886,852.53 = 356,185.28 : x
  2. Step 2: Convert to fraction form
    642,646.70/886,852.53 = 356,185.28/x
  3. Step 3: Cross multiply
    642,646.70x = 886,852.53 × 356,185.28
  4. Step 4: Simplify right side
    642,646.70x = 315,883,816,716.76
  5. Step 5: Solve for x
    x = 315,883,816,716.76/642,646.70
  6. Step 6: Final answer
    x = 491,535.73

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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.