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Finding the Fourth Proportional to 978.15, 1,350.33 and 665.07

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Solution

The fourth proportional to 978.15, 1,350.33 and 665.07 is: 918.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.15 : 1,350.33 = 665.07 : x
  2. Step 2: Convert to fraction form
    978.15/1,350.33 = 665.07/x
  3. Step 3: Cross multiply
    978.15x = 1,350.33 × 665.07
  4. Step 4: Simplify right side
    978.15x = 898,063.97
  5. Step 5: Solve for x
    x = 898,063.97/978.15
  6. Step 6: Final answer
    x = 918.13

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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.