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Finding the Fourth Proportional to 699.54, 1,048.28 and 638.08

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Solution

The fourth proportional to 699.54, 1,048.28 and 638.08 is: 956.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.54 : 1,048.28 = 638.08 : x
  2. Step 2: Convert to fraction form
    699.54/1,048.28 = 638.08/x
  3. Step 3: Cross multiply
    699.54x = 1,048.28 × 638.08
  4. Step 4: Simplify right side
    699.54x = 668,886.50
  5. Step 5: Solve for x
    x = 668,886.50/699.54
  6. Step 6: Final answer
    x = 956.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.