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Finding the Fourth Proportional to 1,652.49, 2,478.63 and 678.57

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Solution

The fourth proportional to 1,652.49, 2,478.63 and 678.57 is: 1,017.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,652.49 : 2,478.63 = 678.57 : x
  2. Step 2: Convert to fraction form
    1,652.49/2,478.63 = 678.57/x
  3. Step 3: Cross multiply
    1,652.49x = 2,478.63 × 678.57
  4. Step 4: Simplify right side
    1,652.49x = 1,681,923.96
  5. Step 5: Solve for x
    x = 1,681,923.96/1,652.49
  6. Step 6: Final answer
    x = 1,017.81

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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.