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Finding the Fourth Proportional to 1,533.42, 2,115.90 and 870.08

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Solution

The fourth proportional to 1,533.42, 2,115.90 and 870.08 is: 1,200.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,533.42 : 2,115.90 = 870.08 : x
  2. Step 2: Convert to fraction form
    1,533.42/2,115.90 = 870.08/x
  3. Step 3: Cross multiply
    1,533.42x = 2,115.90 × 870.08
  4. Step 4: Simplify right side
    1,533.42x = 1,840,991.69
  5. Step 5: Solve for x
    x = 1,840,991.69/1,533.42
  6. Step 6: Final answer
    x = 1,200.58

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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.