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Finding the Fourth Proportional to 615.69, 849.10 and 490.41

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Solution

The fourth proportional to 615.69, 849.10 and 490.41 is: 676.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.69 : 849.10 = 490.41 : x
  2. Step 2: Convert to fraction form
    615.69/849.10 = 490.41/x
  3. Step 3: Cross multiply
    615.69x = 849.10 × 490.41
  4. Step 4: Simplify right side
    615.69x = 416,407.13
  5. Step 5: Solve for x
    x = 416,407.13/615.69
  6. Step 6: Final answer
    x = 676.33

Related Problems

Find fourth proportional to 307.85, 424.55 and 245.21
Half scale
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Double scale
Find fourth proportional to 616.69, 850.48 and 491.41
Similar ratio
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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.