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Finding the Fourth Proportional to 830.86, 1,146.56 and 499.31

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Solution

The fourth proportional to 830.86, 1,146.56 and 499.31 is: 689.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.86 : 1,146.56 = 499.31 : x
  2. Step 2: Convert to fraction form
    830.86/1,146.56 = 499.31/x
  3. Step 3: Cross multiply
    830.86x = 1,146.56 × 499.31
  4. Step 4: Simplify right side
    830.86x = 572,491.39
  5. Step 5: Solve for x
    x = 572,491.39/830.86
  6. Step 6: Final answer
    x = 689.04

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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.