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Finding the Fourth Proportional to 1,869.40, 2,804.45 and 636.70

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Solution

The fourth proportional to 1,869.40, 2,804.45 and 636.70 is: 955.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,869.40 : 2,804.45 = 636.70 : x
  2. Step 2: Convert to fraction form
    1,869.40/2,804.45 = 636.70/x
  3. Step 3: Cross multiply
    1,869.40x = 2,804.45 × 636.70
  4. Step 4: Simplify right side
    1,869.40x = 1,785,593.32
  5. Step 5: Solve for x
    x = 1,785,593.32/1,869.40
  6. Step 6: Final answer
    x = 955.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.