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Finding the Fourth Proportional to 931.02, 1,284.40 and 576.85

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Solution

The fourth proportional to 931.02, 1,284.40 and 576.85 is: 795.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.02 : 1,284.40 = 576.85 : x
  2. Step 2: Convert to fraction form
    931.02/1,284.40 = 576.85/x
  3. Step 3: Cross multiply
    931.02x = 1,284.40 × 576.85
  4. Step 4: Simplify right side
    931.02x = 740,901.49
  5. Step 5: Solve for x
    x = 740,901.49/931.02
  6. Step 6: Final answer
    x = 795.80

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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.