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Finding the Fourth Proportional to 840.11, 1,259.89 and 753.10

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Solution

The fourth proportional to 840.11, 1,259.89 and 753.10 is: 1,129.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.11 : 1,259.89 = 753.10 : x
  2. Step 2: Convert to fraction form
    840.11/1,259.89 = 753.10/x
  3. Step 3: Cross multiply
    840.11x = 1,259.89 × 753.10
  4. Step 4: Simplify right side
    840.11x = 948,818.13
  5. Step 5: Solve for x
    x = 948,818.13/840.11
  6. Step 6: Final answer
    x = 1,129.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.