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Finding the Fourth Proportional to 873.55, 1,310.46 and 386.74

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Solution

The fourth proportional to 873.55, 1,310.46 and 386.74 is: 580.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.55 : 1,310.46 = 386.74 : x
  2. Step 2: Convert to fraction form
    873.55/1,310.46 = 386.74/x
  3. Step 3: Cross multiply
    873.55x = 1,310.46 × 386.74
  4. Step 4: Simplify right side
    873.55x = 506,807.30
  5. Step 5: Solve for x
    x = 506,807.30/873.55
  6. Step 6: Final answer
    x = 580.17

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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.