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Finding the Fourth Proportional to 486.75, 670.63 and 434.30

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Solution

The fourth proportional to 486.75, 670.63 and 434.30 is: 598.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.75 : 670.63 = 434.30 : x
  2. Step 2: Convert to fraction form
    486.75/670.63 = 434.30/x
  3. Step 3: Cross multiply
    486.75x = 670.63 × 434.30
  4. Step 4: Simplify right side
    486.75x = 291,254.61
  5. Step 5: Solve for x
    x = 291,254.61/486.75
  6. Step 6: Final answer
    x = 598.37

Related Problems

Find fourth proportional to 243.38, 335.32 and 217.15
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Double scale
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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.