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Finding the Fourth Proportional to 1,023.44, 1,411.17 and 840.99

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Solution

The fourth proportional to 1,023.44, 1,411.17 and 840.99 is: 1,159.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,023.44 : 1,411.17 = 840.99 : x
  2. Step 2: Convert to fraction form
    1,023.44/1,411.17 = 840.99/x
  3. Step 3: Cross multiply
    1,023.44x = 1,411.17 × 840.99
  4. Step 4: Simplify right side
    1,023.44x = 1,186,779.86
  5. Step 5: Solve for x
    x = 1,186,779.86/1,023.44
  6. Step 6: Final answer
    x = 1,159.60

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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.