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Finding the Fourth Proportional to 910.40, 1,256.22 and 517.40

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Solution

The fourth proportional to 910.40, 1,256.22 and 517.40 is: 713.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.40 : 1,256.22 = 517.40 : x
  2. Step 2: Convert to fraction form
    910.40/1,256.22 = 517.40/x
  3. Step 3: Cross multiply
    910.40x = 1,256.22 × 517.40
  4. Step 4: Simplify right side
    910.40x = 649,968.23
  5. Step 5: Solve for x
    x = 649,968.23/910.40
  6. Step 6: Final answer
    x = 713.94

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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.