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Finding the Fourth Proportional to 495.79, 684.18 and 274.76

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Solution

The fourth proportional to 495.79, 684.18 and 274.76 is: 379.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.79 : 684.18 = 274.76 : x
  2. Step 2: Convert to fraction form
    495.79/684.18 = 274.76/x
  3. Step 3: Cross multiply
    495.79x = 684.18 × 274.76
  4. Step 4: Simplify right side
    495.79x = 187,985.30
  5. Step 5: Solve for x
    x = 187,985.30/495.79
  6. Step 6: Final answer
    x = 379.16

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Find fourth proportional to 247.90, 342.09 and 137.38
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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.