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Finding the Fourth Proportional to 1,234.19, 1,700.84 and 840.53

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Solution

The fourth proportional to 1,234.19, 1,700.84 and 840.53 is: 1,158.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,234.19 : 1,700.84 = 840.53 : x
  2. Step 2: Convert to fraction form
    1,234.19/1,700.84 = 840.53/x
  3. Step 3: Cross multiply
    1,234.19x = 1,700.84 × 840.53
  4. Step 4: Simplify right side
    1,234.19x = 1,429,594.34
  5. Step 5: Solve for x
    x = 1,429,594.34/1,234.19
  6. Step 6: Final answer
    x = 1,158.33

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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.