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Finding the Fourth Proportional to 647.84, 972.20 and 359.48

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Solution

The fourth proportional to 647.84, 972.20 and 359.48 is: 539.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.84 : 972.20 = 359.48 : x
  2. Step 2: Convert to fraction form
    647.84/972.20 = 359.48/x
  3. Step 3: Cross multiply
    647.84x = 972.20 × 359.48
  4. Step 4: Simplify right side
    647.84x = 349,486.46
  5. Step 5: Solve for x
    x = 349,486.46/647.84
  6. Step 6: Final answer
    x = 539.46

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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.