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Finding the Fourth Proportional to 1,135.84, 1,567.38 and 670

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Solution

The fourth proportional to 1,135.84, 1,567.38 and 670 is: 924.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.84 : 1,567.38 = 670 : x
  2. Step 2: Convert to fraction form
    1,135.84/1,567.38 = 670/x
  3. Step 3: Cross multiply
    1,135.84x = 1,567.38 × 670
  4. Step 4: Simplify right side
    1,135.84x = 1,050,144.60
  5. Step 5: Solve for x
    x = 1,050,144.60/1,135.84
  6. Step 6: Final answer
    x = 924.55

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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.