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Finding the Fourth Proportional to 874.66, 1,312.40 and 387.65

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Solution

The fourth proportional to 874.66, 1,312.40 and 387.65 is: 581.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.66 : 1,312.40 = 387.65 : x
  2. Step 2: Convert to fraction form
    874.66/1,312.40 = 387.65/x
  3. Step 3: Cross multiply
    874.66x = 1,312.40 × 387.65
  4. Step 4: Simplify right side
    874.66x = 508,751.86
  5. Step 5: Solve for x
    x = 508,751.86/874.66
  6. Step 6: Final answer
    x = 581.66

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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.