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Finding the Fourth Proportional to 469.43, 647.91 and 312.07

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Solution

The fourth proportional to 469.43, 647.91 and 312.07 is: 430.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.43 : 647.91 = 312.07 : x
  2. Step 2: Convert to fraction form
    469.43/647.91 = 312.07/x
  3. Step 3: Cross multiply
    469.43x = 647.91 × 312.07
  4. Step 4: Simplify right side
    469.43x = 202,193.27
  5. Step 5: Solve for x
    x = 202,193.27/469.43
  6. Step 6: Final answer
    x = 430.72

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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.