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Finding the Fourth Proportional to 874.63, 1,312.45 and 387.68

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Solution

The fourth proportional to 874.63, 1,312.45 and 387.68 is: 581.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.63 : 1,312.45 = 387.68 : x
  2. Step 2: Convert to fraction form
    874.63/1,312.45 = 387.68/x
  3. Step 3: Cross multiply
    874.63x = 1,312.45 × 387.68
  4. Step 4: Simplify right side
    874.63x = 508,810.62
  5. Step 5: Solve for x
    x = 508,810.62/874.63
  6. Step 6: Final answer
    x = 581.75

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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.