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Finding the Fourth Proportional to 870.51, 1,200.63 and 635.34

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Solution

The fourth proportional to 870.51, 1,200.63 and 635.34 is: 876.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.51 : 1,200.63 = 635.34 : x
  2. Step 2: Convert to fraction form
    870.51/1,200.63 = 635.34/x
  3. Step 3: Cross multiply
    870.51x = 1,200.63 × 635.34
  4. Step 4: Simplify right side
    870.51x = 762,808.26
  5. Step 5: Solve for x
    x = 762,808.26/870.51
  6. Step 6: Final answer
    x = 876.28

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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.