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Finding the Fourth Proportional to 631.25, 870.87 and 465.86

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Solution

The fourth proportional to 631.25, 870.87 and 465.86 is: 642.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.25 : 870.87 = 465.86 : x
  2. Step 2: Convert to fraction form
    631.25/870.87 = 465.86/x
  3. Step 3: Cross multiply
    631.25x = 870.87 × 465.86
  4. Step 4: Simplify right side
    631.25x = 405,703.50
  5. Step 5: Solve for x
    x = 405,703.50/631.25
  6. Step 6: Final answer
    x = 642.70

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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.