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Finding the Fourth Proportional to 830.74, 1,145.69 and 499.05

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Solution

The fourth proportional to 830.74, 1,145.69 and 499.05 is: 688.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.74 : 1,145.69 = 499.05 : x
  2. Step 2: Convert to fraction form
    830.74/1,145.69 = 499.05/x
  3. Step 3: Cross multiply
    830.74x = 1,145.69 × 499.05
  4. Step 4: Simplify right side
    830.74x = 571,750.87
  5. Step 5: Solve for x
    x = 571,750.87/830.74
  6. Step 6: Final answer
    x = 688.24

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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.