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Finding the Fourth Proportional to 1,438.95, 1,985.68 and 880.35

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Solution

The fourth proportional to 1,438.95, 1,985.68 and 880.35 is: 1,214.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.95 : 1,985.68 = 880.35 : x
  2. Step 2: Convert to fraction form
    1,438.95/1,985.68 = 880.35/x
  3. Step 3: Cross multiply
    1,438.95x = 1,985.68 × 880.35
  4. Step 4: Simplify right side
    1,438.95x = 1,748,093.39
  5. Step 5: Solve for x
    x = 1,748,093.39/1,438.95
  6. Step 6: Final answer
    x = 1,214.84

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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.