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Finding the Fourth Proportional to 977.89, 1,467.78 and 430.27

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Solution

The fourth proportional to 977.89, 1,467.78 and 430.27 is: 645.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.89 : 1,467.78 = 430.27 : x
  2. Step 2: Convert to fraction form
    977.89/1,467.78 = 430.27/x
  3. Step 3: Cross multiply
    977.89x = 1,467.78 × 430.27
  4. Step 4: Simplify right side
    977.89x = 631,541.70
  5. Step 5: Solve for x
    x = 631,541.70/977.89
  6. Step 6: Final answer
    x = 645.82

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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.