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Finding the Fourth Proportional to 470.07, 647.87 and 386.91

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Solution

The fourth proportional to 470.07, 647.87 and 386.91 is: 533.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.07 : 647.87 = 386.91 : x
  2. Step 2: Convert to fraction form
    470.07/647.87 = 386.91/x
  3. Step 3: Cross multiply
    470.07x = 647.87 × 386.91
  4. Step 4: Simplify right side
    470.07x = 250,665.45
  5. Step 5: Solve for x
    x = 250,665.45/470.07
  6. Step 6: Final answer
    x = 533.25

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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.