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Finding the Fourth Proportional to 1,528.95, 2,289.65 and 878.43

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Solution

The fourth proportional to 1,528.95, 2,289.65 and 878.43 is: 1,315.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.95 : 2,289.65 = 878.43 : x
  2. Step 2: Convert to fraction form
    1,528.95/2,289.65 = 878.43/x
  3. Step 3: Cross multiply
    1,528.95x = 2,289.65 × 878.43
  4. Step 4: Simplify right side
    1,528.95x = 2,011,292.86
  5. Step 5: Solve for x
    x = 2,011,292.86/1,528.95
  6. Step 6: Final answer
    x = 1,315.47

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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.