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Finding the Fourth Proportional to 1,207.86, 1,666.91 and 912.61

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Solution

The fourth proportional to 1,207.86, 1,666.91 and 912.61 is: 1,259.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.86 : 1,666.91 = 912.61 : x
  2. Step 2: Convert to fraction form
    1,207.86/1,666.91 = 912.61/x
  3. Step 3: Cross multiply
    1,207.86x = 1,666.91 × 912.61
  4. Step 4: Simplify right side
    1,207.86x = 1,521,238.74
  5. Step 5: Solve for x
    x = 1,521,238.74/1,207.86
  6. Step 6: Final answer
    x = 1,259.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.