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Finding the Fourth Proportional to 1,570.78, 2,355.90 and 646.30

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Solution

The fourth proportional to 1,570.78, 2,355.90 and 646.30 is: 969.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.78 : 2,355.90 = 646.30 : x
  2. Step 2: Convert to fraction form
    1,570.78/2,355.90 = 646.30/x
  3. Step 3: Cross multiply
    1,570.78x = 2,355.90 × 646.30
  4. Step 4: Simplify right side
    1,570.78x = 1,522,618.17
  5. Step 5: Solve for x
    x = 1,522,618.17/1,570.78
  6. Step 6: Final answer
    x = 969.34

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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.