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Finding the Fourth Proportional to 870.54, 1,201.40 and 608.64

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Solution

The fourth proportional to 870.54, 1,201.40 and 608.64 is: 839.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.54 : 1,201.40 = 608.64 : x
  2. Step 2: Convert to fraction form
    870.54/1,201.40 = 608.64/x
  3. Step 3: Cross multiply
    870.54x = 1,201.40 × 608.64
  4. Step 4: Simplify right side
    870.54x = 731,220.10
  5. Step 5: Solve for x
    x = 731,220.10/870.54
  6. Step 6: Final answer
    x = 839.96

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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.