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Finding the Fourth Proportional to 647.28, 891.54 and 536.40

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Solution

The fourth proportional to 647.28, 891.54 and 536.40 is: 738.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.28 : 891.54 = 536.40 : x
  2. Step 2: Convert to fraction form
    647.28/891.54 = 536.40/x
  3. Step 3: Cross multiply
    647.28x = 891.54 × 536.40
  4. Step 4: Simplify right side
    647.28x = 478,222.06
  5. Step 5: Solve for x
    x = 478,222.06/647.28
  6. Step 6: Final answer
    x = 738.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.