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Finding the Fourth Proportional to 935.64, 1,400.58 and 780.12

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Solution

The fourth proportional to 935.64, 1,400.58 and 780.12 is: 1,167.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.64 : 1,400.58 = 780.12 : x
  2. Step 2: Convert to fraction form
    935.64/1,400.58 = 780.12/x
  3. Step 3: Cross multiply
    935.64x = 1,400.58 × 780.12
  4. Step 4: Simplify right side
    935.64x = 1,092,620.47
  5. Step 5: Solve for x
    x = 1,092,620.47/935.64
  6. Step 6: Final answer
    x = 1,167.78

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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.