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Finding the Fourth Proportional to 469.29, 647.55 and 312.27

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Solution

The fourth proportional to 469.29, 647.55 and 312.27 is: 430.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.29 : 647.55 = 312.27 : x
  2. Step 2: Convert to fraction form
    469.29/647.55 = 312.27/x
  3. Step 3: Cross multiply
    469.29x = 647.55 × 312.27
  4. Step 4: Simplify right side
    469.29x = 202,210.44
  5. Step 5: Solve for x
    x = 202,210.44/469.29
  6. Step 6: Final answer
    x = 430.89

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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.