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Finding the Fourth Proportional to 873.65, 1,310.90 and 386.63

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Solution

The fourth proportional to 873.65, 1,310.90 and 386.63 is: 580.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.65 : 1,310.90 = 386.63 : x
  2. Step 2: Convert to fraction form
    873.65/1,310.90 = 386.63/x
  3. Step 3: Cross multiply
    873.65x = 1,310.90 × 386.63
  4. Step 4: Simplify right side
    873.65x = 506,824.78
  5. Step 5: Solve for x
    x = 506,824.78/873.65
  6. Step 6: Final answer
    x = 580.13

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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.