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Finding the Fourth Proportional to 1,419.76, 2,125.50 and 870.25

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Solution

The fourth proportional to 1,419.76, 2,125.50 and 870.25 is: 1,302.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.76 : 2,125.50 = 870.25 : x
  2. Step 2: Convert to fraction form
    1,419.76/2,125.50 = 870.25/x
  3. Step 3: Cross multiply
    1,419.76x = 2,125.50 × 870.25
  4. Step 4: Simplify right side
    1,419.76x = 1,849,716.38
  5. Step 5: Solve for x
    x = 1,849,716.38/1,419.76
  6. Step 6: Final answer
    x = 1,302.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.