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Finding the Fourth Proportional to 669.69, 1,005.98 and 647.82

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Solution

The fourth proportional to 669.69, 1,005.98 and 647.82 is: 973.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.69 : 1,005.98 = 647.82 : x
  2. Step 2: Convert to fraction form
    669.69/1,005.98 = 647.82/x
  3. Step 3: Cross multiply
    669.69x = 1,005.98 × 647.82
  4. Step 4: Simplify right side
    669.69x = 651,693.96
  5. Step 5: Solve for x
    x = 651,693.96/669.69
  6. Step 6: Final answer
    x = 973.13

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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.