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Finding the Fourth Proportional to 977.45, 1,465.34 and 429.21

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Solution

The fourth proportional to 977.45, 1,465.34 and 429.21 is: 643.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.45 : 1,465.34 = 429.21 : x
  2. Step 2: Convert to fraction form
    977.45/1,465.34 = 429.21/x
  3. Step 3: Cross multiply
    977.45x = 1,465.34 × 429.21
  4. Step 4: Simplify right side
    977.45x = 628,936.44
  5. Step 5: Solve for x
    x = 628,936.44/977.45
  6. Step 6: Final answer
    x = 643.45

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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.