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Finding the Fourth Proportional to 977.84, 1,349.04 and 646.46

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Solution

The fourth proportional to 977.84, 1,349.04 and 646.46 is: 891.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.84 : 1,349.04 = 646.46 : x
  2. Step 2: Convert to fraction form
    977.84/1,349.04 = 646.46/x
  3. Step 3: Cross multiply
    977.84x = 1,349.04 × 646.46
  4. Step 4: Simplify right side
    977.84x = 872,100.40
  5. Step 5: Solve for x
    x = 872,100.40/977.84
  6. Step 6: Final answer
    x = 891.86

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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.