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Finding the Fourth Proportional to 909.96, 1,256.12 and 647.92

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Solution

The fourth proportional to 909.96, 1,256.12 and 647.92 is: 894.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.96 : 1,256.12 = 647.92 : x
  2. Step 2: Convert to fraction form
    909.96/1,256.12 = 647.92/x
  3. Step 3: Cross multiply
    909.96x = 1,256.12 × 647.92
  4. Step 4: Simplify right side
    909.96x = 813,865.27
  5. Step 5: Solve for x
    x = 813,865.27/909.96
  6. Step 6: Final answer
    x = 894.40

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1.5x scale

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.