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Finding the Fourth Proportional to 670.76, 1,006.40 and 260.18

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Solution

The fourth proportional to 670.76, 1,006.40 and 260.18 is: 390.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.76 : 1,006.40 = 260.18 : x
  2. Step 2: Convert to fraction form
    670.76/1,006.40 = 260.18/x
  3. Step 3: Cross multiply
    670.76x = 1,006.40 × 260.18
  4. Step 4: Simplify right side
    670.76x = 261,838.82
  5. Step 5: Solve for x
    x = 261,838.82/670.76
  6. Step 6: Final answer
    x = 390.36

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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.