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Finding the Fourth Proportional to 698.47, 1,048.10 and 643.39

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Solution

The fourth proportional to 698.47, 1,048.10 and 643.39 is: 965.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.47 : 1,048.10 = 643.39 : x
  2. Step 2: Convert to fraction form
    698.47/1,048.10 = 643.39/x
  3. Step 3: Cross multiply
    698.47x = 1,048.10 × 643.39
  4. Step 4: Simplify right side
    698.47x = 674,337.06
  5. Step 5: Solve for x
    x = 674,337.06/698.47
  6. Step 6: Final answer
    x = 965.45

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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.