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Finding the Fourth Proportional to 1,141.61, 1,712.46 and 319.94

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Solution

The fourth proportional to 1,141.61, 1,712.46 and 319.94 is: 479.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.61 : 1,712.46 = 319.94 : x
  2. Step 2: Convert to fraction form
    1,141.61/1,712.46 = 319.94/x
  3. Step 3: Cross multiply
    1,141.61x = 1,712.46 × 319.94
  4. Step 4: Simplify right side
    1,141.61x = 547,875.89
  5. Step 5: Solve for x
    x = 547,875.89/1,141.61
  6. Step 6: Final answer
    x = 479.92

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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.