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Finding the Fourth Proportional to 1,076.76, 1,485.40 and 840.28

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Solution

The fourth proportional to 1,076.76, 1,485.40 and 840.28 is: 1,159.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.76 : 1,485.40 = 840.28 : x
  2. Step 2: Convert to fraction form
    1,076.76/1,485.40 = 840.28/x
  3. Step 3: Cross multiply
    1,076.76x = 1,485.40 × 840.28
  4. Step 4: Simplify right side
    1,076.76x = 1,248,151.91
  5. Step 5: Solve for x
    x = 1,248,151.91/1,076.76
  6. Step 6: Final answer
    x = 1,159.17

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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.