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Finding the Fourth Proportional to 869.66, 1,303.94 and 580.76

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Solution

The fourth proportional to 869.66, 1,303.94 and 580.76 is: 870.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.66 : 1,303.94 = 580.76 : x
  2. Step 2: Convert to fraction form
    869.66/1,303.94 = 580.76/x
  3. Step 3: Cross multiply
    869.66x = 1,303.94 × 580.76
  4. Step 4: Simplify right side
    869.66x = 757,276.19
  5. Step 5: Solve for x
    x = 757,276.19/869.66
  6. Step 6: Final answer
    x = 870.77

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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.