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Finding the Fourth Proportional to 469.74, 647.79 and 417.12

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Solution

The fourth proportional to 469.74, 647.79 and 417.12 is: 575.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.74 : 647.79 = 417.12 : x
  2. Step 2: Convert to fraction form
    469.74/647.79 = 417.12/x
  3. Step 3: Cross multiply
    469.74x = 647.79 × 417.12
  4. Step 4: Simplify right side
    469.74x = 270,206.16
  5. Step 5: Solve for x
    x = 270,206.16/469.74
  6. Step 6: Final answer
    x = 575.22

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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.