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Finding the Fourth Proportional to 977.99, 1,350.21 and 646.97

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Solution

The fourth proportional to 977.99, 1,350.21 and 646.97 is: 893.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.99 : 1,350.21 = 646.97 : x
  2. Step 2: Convert to fraction form
    977.99/1,350.21 = 646.97/x
  3. Step 3: Cross multiply
    977.99x = 1,350.21 × 646.97
  4. Step 4: Simplify right side
    977.99x = 873,538.61
  5. Step 5: Solve for x
    x = 873,538.61/977.99
  6. Step 6: Final answer
    x = 893.20

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1.5x scale

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.