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Finding the Fourth Proportional to 1,985.76, 2,978.06 and 752.28

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Solution

The fourth proportional to 1,985.76, 2,978.06 and 752.28 is: 1,128.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.76 : 2,978.06 = 752.28 : x
  2. Step 2: Convert to fraction form
    1,985.76/2,978.06 = 752.28/x
  3. Step 3: Cross multiply
    1,985.76x = 2,978.06 × 752.28
  4. Step 4: Simplify right side
    1,985.76x = 2,240,334.98
  5. Step 5: Solve for x
    x = 2,240,334.98/1,985.76
  6. Step 6: Final answer
    x = 1,128.20

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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.