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Finding the Fourth Proportional to 643,316.76, 887,778 and 356,836.84

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Solution

The fourth proportional to 643,316.76, 887,778 and 356,836.84 is: 492,435.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,316.76 : 887,778 = 356,836.84 : x
  2. Step 2: Convert to fraction form
    643,316.76/887,778 = 356,836.84/x
  3. Step 3: Cross multiply
    643,316.76x = 887,778 × 356,836.84
  4. Step 4: Simplify right side
    643,316.76x = 316,791,896,141.52
  5. Step 5: Solve for x
    x = 316,791,896,141.52/643,316.76
  6. Step 6: Final answer
    x = 492,435.32

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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.