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Finding the Fourth Proportional to 873.12, 1,315.90 and 873.12

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Solution

The fourth proportional to 873.12, 1,315.90 and 873.12 is: 1,315.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.12 : 1,315.90 = 873.12 : x
  2. Step 2: Convert to fraction form
    873.12/1,315.90 = 873.12/x
  3. Step 3: Cross multiply
    873.12x = 1,315.90 × 873.12
  4. Step 4: Simplify right side
    873.12x = 1,148,936.43
  5. Step 5: Solve for x
    x = 1,148,936.43/873.12
  6. Step 6: Final answer
    x = 1,315.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.