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Finding the Fourth Proportional to 1,305.47, 1,802.76 and 840.53

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Solution

The fourth proportional to 1,305.47, 1,802.76 and 840.53 is: 1,160.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.47 : 1,802.76 = 840.53 : x
  2. Step 2: Convert to fraction form
    1,305.47/1,802.76 = 840.53/x
  3. Step 3: Cross multiply
    1,305.47x = 1,802.76 × 840.53
  4. Step 4: Simplify right side
    1,305.47x = 1,515,273.86
  5. Step 5: Solve for x
    x = 1,515,273.86/1,305.47
  6. Step 6: Final answer
    x = 1,160.71

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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.