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Finding the Fourth Proportional to 1,570.49, 2,355.33 and 646.30

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Solution

The fourth proportional to 1,570.49, 2,355.33 and 646.30 is: 969.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.49 : 2,355.33 = 646.30 : x
  2. Step 2: Convert to fraction form
    1,570.49/2,355.33 = 646.30/x
  3. Step 3: Cross multiply
    1,570.49x = 2,355.33 × 646.30
  4. Step 4: Simplify right side
    1,570.49x = 1,522,249.78
  5. Step 5: Solve for x
    x = 1,522,249.78/1,570.49
  6. Step 6: Final answer
    x = 969.28

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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.