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Finding the Fourth Proportional to 807.21, 1,113.30 and 708.75

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Solution

The fourth proportional to 807.21, 1,113.30 and 708.75 is: 977.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.21 : 1,113.30 = 708.75 : x
  2. Step 2: Convert to fraction form
    807.21/1,113.30 = 708.75/x
  3. Step 3: Cross multiply
    807.21x = 1,113.30 × 708.75
  4. Step 4: Simplify right side
    807.21x = 789,051.38
  5. Step 5: Solve for x
    x = 789,051.38/807.21
  6. Step 6: Final answer
    x = 977.50

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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.