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Finding the Fourth Proportional to 977.61, 1,348.59 and 579.04

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Solution

The fourth proportional to 977.61, 1,348.59 and 579.04 is: 798.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.61 : 1,348.59 = 579.04 : x
  2. Step 2: Convert to fraction form
    977.61/1,348.59 = 579.04/x
  3. Step 3: Cross multiply
    977.61x = 1,348.59 × 579.04
  4. Step 4: Simplify right side
    977.61x = 780,887.55
  5. Step 5: Solve for x
    x = 780,887.55/977.61
  6. Step 6: Final answer
    x = 798.77

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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.