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Finding the Fourth Proportional to 977.60, 1,348.86 and 646.56

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Solution

The fourth proportional to 977.60, 1,348.86 and 646.56 is: 892.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.60 : 1,348.86 = 646.56 : x
  2. Step 2: Convert to fraction form
    977.60/1,348.86 = 646.56/x
  3. Step 3: Cross multiply
    977.60x = 1,348.86 × 646.56
  4. Step 4: Simplify right side
    977.60x = 872,118.92
  5. Step 5: Solve for x
    x = 872,118.92/977.60
  6. Step 6: Final answer
    x = 892.10

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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.