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Finding the Fourth Proportional to 1,011.78, 1,520.10 and 647.28

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Solution

The fourth proportional to 1,011.78, 1,520.10 and 647.28 is: 972.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.78 : 1,520.10 = 647.28 : x
  2. Step 2: Convert to fraction form
    1,011.78/1,520.10 = 647.28/x
  3. Step 3: Cross multiply
    1,011.78x = 1,520.10 × 647.28
  4. Step 4: Simplify right side
    1,011.78x = 983,930.33
  5. Step 5: Solve for x
    x = 983,930.33/1,011.78
  6. Step 6: Final answer
    x = 972.47

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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.