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Finding the Fourth Proportional to 1,305.53, 1,801.27 and 840.05

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Solution

The fourth proportional to 1,305.53, 1,801.27 and 840.05 is: 1,159.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.53 : 1,801.27 = 840.05 : x
  2. Step 2: Convert to fraction form
    1,305.53/1,801.27 = 840.05/x
  3. Step 3: Cross multiply
    1,305.53x = 1,801.27 × 840.05
  4. Step 4: Simplify right side
    1,305.53x = 1,513,156.86
  5. Step 5: Solve for x
    x = 1,513,156.86/1,305.53
  6. Step 6: Final answer
    x = 1,159.04

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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.