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Finding the Fourth Proportional to 870.04, 1,200.18 and 739.36

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Solution

The fourth proportional to 870.04, 1,200.18 and 739.36 is: 1,019.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.04 : 1,200.18 = 739.36 : x
  2. Step 2: Convert to fraction form
    870.04/1,200.18 = 739.36/x
  3. Step 3: Cross multiply
    870.04x = 1,200.18 × 739.36
  4. Step 4: Simplify right side
    870.04x = 887,365.08
  5. Step 5: Solve for x
    x = 887,365.08/870.04
  6. Step 6: Final answer
    x = 1,019.91

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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.