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Finding the Fourth Proportional to 909.72, 1,256.58 and 661.86

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Solution

The fourth proportional to 909.72, 1,256.58 and 661.86 is: 914.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.72 : 1,256.58 = 661.86 : x
  2. Step 2: Convert to fraction form
    909.72/1,256.58 = 661.86/x
  3. Step 3: Cross multiply
    909.72x = 1,256.58 × 661.86
  4. Step 4: Simplify right side
    909.72x = 831,680.04
  5. Step 5: Solve for x
    x = 831,680.04/909.72
  6. Step 6: Final answer
    x = 914.22

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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.