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Finding the Fourth Proportional to 977.07, 1,465.96 and 429.65

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Solution

The fourth proportional to 977.07, 1,465.96 and 429.65 is: 644.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.07 : 1,465.96 = 429.65 : x
  2. Step 2: Convert to fraction form
    977.07/1,465.96 = 429.65/x
  3. Step 3: Cross multiply
    977.07x = 1,465.96 × 429.65
  4. Step 4: Simplify right side
    977.07x = 629,849.71
  5. Step 5: Solve for x
    x = 629,849.71/977.07
  6. Step 6: Final answer
    x = 644.63

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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.