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Finding the Fourth Proportional to 1,108.76, 1,655.60 and 976

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Solution

The fourth proportional to 1,108.76, 1,655.60 and 976 is: 1,457.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.76 : 1,655.60 = 976 : x
  2. Step 2: Convert to fraction form
    1,108.76/1,655.60 = 976/x
  3. Step 3: Cross multiply
    1,108.76x = 1,655.60 × 976
  4. Step 4: Simplify right side
    1,108.76x = 1,615,865.60
  5. Step 5: Solve for x
    x = 1,615,865.60/1,108.76
  6. Step 6: Final answer
    x = 1,457.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.