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Finding the Fourth Proportional to 699.68, 964.74 and 478.76

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Solution

The fourth proportional to 699.68, 964.74 and 478.76 is: 660.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.68 : 964.74 = 478.76 : x
  2. Step 2: Convert to fraction form
    699.68/964.74 = 478.76/x
  3. Step 3: Cross multiply
    699.68x = 964.74 × 478.76
  4. Step 4: Simplify right side
    699.68x = 461,878.92
  5. Step 5: Solve for x
    x = 461,878.92/699.68
  6. Step 6: Final answer
    x = 660.13

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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.