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Finding the Fourth Proportional to 869.12, 1,303.68 and 291.99

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Solution

The fourth proportional to 869.12, 1,303.68 and 291.99 is: 437.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.12 : 1,303.68 = 291.99 : x
  2. Step 2: Convert to fraction form
    869.12/1,303.68 = 291.99/x
  3. Step 3: Cross multiply
    869.12x = 1,303.68 × 291.99
  4. Step 4: Simplify right side
    869.12x = 380,661.52
  5. Step 5: Solve for x
    x = 380,661.52/869.12
  6. Step 6: Final answer
    x = 437.99

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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.