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Finding the Fourth Proportional to 696.91, 1,039.99 and 624.01

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Solution

The fourth proportional to 696.91, 1,039.99 and 624.01 is: 931.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.91 : 1,039.99 = 624.01 : x
  2. Step 2: Convert to fraction form
    696.91/1,039.99 = 624.01/x
  3. Step 3: Cross multiply
    696.91x = 1,039.99 × 624.01
  4. Step 4: Simplify right side
    696.91x = 648,964.16
  5. Step 5: Solve for x
    x = 648,964.16/696.91
  6. Step 6: Final answer
    x = 931.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.