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Finding the Fourth Proportional to 631.04, 870.43 and 407.26

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Solution

The fourth proportional to 631.04, 870.43 and 407.26 is: 561.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.04 : 870.43 = 407.26 : x
  2. Step 2: Convert to fraction form
    631.04/870.43 = 407.26/x
  3. Step 3: Cross multiply
    631.04x = 870.43 × 407.26
  4. Step 4: Simplify right side
    631.04x = 354,487.36
  5. Step 5: Solve for x
    x = 354,487.36/631.04
  6. Step 6: Final answer
    x = 561.75

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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.