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Finding the Fourth Proportional to 830.70, 1,244.70 and 782.10

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Solution

The fourth proportional to 830.70, 1,244.70 and 782.10 is: 1,171.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.70 : 1,244.70 = 782.10 : x
  2. Step 2: Convert to fraction form
    830.70/1,244.70 = 782.10/x
  3. Step 3: Cross multiply
    830.70x = 1,244.70 × 782.10
  4. Step 4: Simplify right side
    830.70x = 973,479.87
  5. Step 5: Solve for x
    x = 973,479.87/830.70
  6. Step 6: Final answer
    x = 1,171.88

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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.