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Finding the Fourth Proportional to 1,693.07, 2,539.58 and 870.90

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Solution

The fourth proportional to 1,693.07, 2,539.58 and 870.90 is: 1,306.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,693.07 : 2,539.58 = 870.90 : x
  2. Step 2: Convert to fraction form
    1,693.07/2,539.58 = 870.90/x
  3. Step 3: Cross multiply
    1,693.07x = 2,539.58 × 870.90
  4. Step 4: Simplify right side
    1,693.07x = 2,211,715.87
  5. Step 5: Solve for x
    x = 2,211,715.87/1,693.07
  6. Step 6: Final answer
    x = 1,306.34

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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.