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Finding the Fourth Proportional to 1,405.78, 1,940 and 776.32

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Solution

The fourth proportional to 1,405.78, 1,940 and 776.32 is: 1,071.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.78 : 1,940 = 776.32 : x
  2. Step 2: Convert to fraction form
    1,405.78/1,940 = 776.32/x
  3. Step 3: Cross multiply
    1,405.78x = 1,940 × 776.32
  4. Step 4: Simplify right side
    1,405.78x = 1,506,060.80
  5. Step 5: Solve for x
    x = 1,506,060.80/1,405.78
  6. Step 6: Final answer
    x = 1,071.33

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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.