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Finding the Fourth Proportional to 912.84, 1,259.26 and 647.33

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Solution

The fourth proportional to 912.84, 1,259.26 and 647.33 is: 892.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.84 : 1,259.26 = 647.33 : x
  2. Step 2: Convert to fraction form
    912.84/1,259.26 = 647.33/x
  3. Step 3: Cross multiply
    912.84x = 1,259.26 × 647.33
  4. Step 4: Simplify right side
    912.84x = 815,156.78
  5. Step 5: Solve for x
    x = 815,156.78/912.84
  6. Step 6: Final answer
    x = 892.99

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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.