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Finding the Fourth Proportional to 1,265.20, 1,894.30 and 647.58

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Solution

The fourth proportional to 1,265.20, 1,894.30 and 647.58 is: 969.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.20 : 1,894.30 = 647.58 : x
  2. Step 2: Convert to fraction form
    1,265.20/1,894.30 = 647.58/x
  3. Step 3: Cross multiply
    1,265.20x = 1,894.30 × 647.58
  4. Step 4: Simplify right side
    1,265.20x = 1,226,710.79
  5. Step 5: Solve for x
    x = 1,226,710.79/1,265.20
  6. Step 6: Final answer
    x = 969.58

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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.