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Finding the Fourth Proportional to 909.07, 1,360.58 and 612.21

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Solution

The fourth proportional to 909.07, 1,360.58 and 612.21 is: 916.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.07 : 1,360.58 = 612.21 : x
  2. Step 2: Convert to fraction form
    909.07/1,360.58 = 612.21/x
  3. Step 3: Cross multiply
    909.07x = 1,360.58 × 612.21
  4. Step 4: Simplify right side
    909.07x = 832,958.51
  5. Step 5: Solve for x
    x = 832,958.51/909.07
  6. Step 6: Final answer
    x = 916.27

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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.