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Finding the Fourth Proportional to 609.95, 914.15 and 390.49

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Solution

The fourth proportional to 609.95, 914.15 and 390.49 is: 585.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.95 : 914.15 = 390.49 : x
  2. Step 2: Convert to fraction form
    609.95/914.15 = 390.49/x
  3. Step 3: Cross multiply
    609.95x = 914.15 × 390.49
  4. Step 4: Simplify right side
    609.95x = 356,966.43
  5. Step 5: Solve for x
    x = 356,966.43/609.95
  6. Step 6: Final answer
    x = 585.24

Related Problems

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Half scale
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Double scale
Find fourth proportional to 610.95, 915.65 and 391.49
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.