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Finding the Fourth Proportional to 979.69, 1,352.03 and 647.53

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Solution

The fourth proportional to 979.69, 1,352.03 and 647.53 is: 893.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.69 : 1,352.03 = 647.53 : x
  2. Step 2: Convert to fraction form
    979.69/1,352.03 = 647.53/x
  3. Step 3: Cross multiply
    979.69x = 1,352.03 × 647.53
  4. Step 4: Simplify right side
    979.69x = 875,479.99
  5. Step 5: Solve for x
    x = 875,479.99/979.69
  6. Step 6: Final answer
    x = 893.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.