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Finding the Fourth Proportional to 1,043.28, 1,564.89 and 312.87

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Solution

The fourth proportional to 1,043.28, 1,564.89 and 312.87 is: 469.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.28 : 1,564.89 = 312.87 : x
  2. Step 2: Convert to fraction form
    1,043.28/1,564.89 = 312.87/x
  3. Step 3: Cross multiply
    1,043.28x = 1,564.89 × 312.87
  4. Step 4: Simplify right side
    1,043.28x = 489,607.13
  5. Step 5: Solve for x
    x = 489,607.13/1,043.28
  6. Step 6: Final answer
    x = 469.30

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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.