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Finding the Fourth Proportional to 670.88, 1,005.42 and 651.17

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Solution

The fourth proportional to 670.88, 1,005.42 and 651.17 is: 975.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.88 : 1,005.42 = 651.17 : x
  2. Step 2: Convert to fraction form
    670.88/1,005.42 = 651.17/x
  3. Step 3: Cross multiply
    670.88x = 1,005.42 × 651.17
  4. Step 4: Simplify right side
    670.88x = 654,699.34
  5. Step 5: Solve for x
    x = 654,699.34/670.88
  6. Step 6: Final answer
    x = 975.88

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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.