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Finding the Fourth Proportional to 840.10, 1,156.24 and 689.44

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Solution

The fourth proportional to 840.10, 1,156.24 and 689.44 is: 948.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.10 : 1,156.24 = 689.44 : x
  2. Step 2: Convert to fraction form
    840.10/1,156.24 = 689.44/x
  3. Step 3: Cross multiply
    840.10x = 1,156.24 × 689.44
  4. Step 4: Simplify right side
    840.10x = 797,158.11
  5. Step 5: Solve for x
    x = 797,158.11/840.10
  6. Step 6: Final answer
    x = 948.88

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1.5x scale

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.