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Finding the Fourth Proportional to 1,403.66, 1,936.95 and 774.15

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Solution

The fourth proportional to 1,403.66, 1,936.95 and 774.15 is: 1,068.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.66 : 1,936.95 = 774.15 : x
  2. Step 2: Convert to fraction form
    1,403.66/1,936.95 = 774.15/x
  3. Step 3: Cross multiply
    1,403.66x = 1,936.95 × 774.15
  4. Step 4: Simplify right side
    1,403.66x = 1,499,492.75
  5. Step 5: Solve for x
    x = 1,499,492.75/1,403.66
  6. Step 6: Final answer
    x = 1,068.28

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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.