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Finding the Fourth Proportional to 910, 1,255.34 and 615.36

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Solution

The fourth proportional to 910, 1,255.34 and 615.36 is: 848.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    910 : 1,255.34 = 615.36 : x
  2. Step 2: Convert to fraction form
    910/1,255.34 = 615.36/x
  3. Step 3: Cross multiply
    910x = 1,255.34 × 615.36
  4. Step 4: Simplify right side
    910x = 772,486.02
  5. Step 5: Solve for x
    x = 772,486.02/910
  6. Step 6: Final answer
    x = 848.89

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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.