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Finding the Fourth Proportional to 649.80, 975.24 and 647.28

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Solution

The fourth proportional to 649.80, 975.24 and 647.28 is: 971.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.80 : 975.24 = 647.28 : x
  2. Step 2: Convert to fraction form
    649.80/975.24 = 647.28/x
  3. Step 3: Cross multiply
    649.80x = 975.24 × 647.28
  4. Step 4: Simplify right side
    649.80x = 631,253.35
  5. Step 5: Solve for x
    x = 631,253.35/649.80
  6. Step 6: Final answer
    x = 971.46

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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.