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Finding the Fourth Proportional to 485.40, 669.62 and 374.76

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Solution

The fourth proportional to 485.40, 669.62 and 374.76 is: 516.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.40 : 669.62 = 374.76 : x
  2. Step 2: Convert to fraction form
    485.40/669.62 = 374.76/x
  3. Step 3: Cross multiply
    485.40x = 669.62 × 374.76
  4. Step 4: Simplify right side
    485.40x = 250,946.79
  5. Step 5: Solve for x
    x = 250,946.79/485.40
  6. Step 6: Final answer
    x = 516.99

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Find fourth proportional to 242.70, 334.81 and 187.38
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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.