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Finding the Fourth Proportional to 985.65, 1,479.57 and 620.74

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Solution

The fourth proportional to 985.65, 1,479.57 and 620.74 is: 931.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.65 : 1,479.57 = 620.74 : x
  2. Step 2: Convert to fraction form
    985.65/1,479.57 = 620.74/x
  3. Step 3: Cross multiply
    985.65x = 1,479.57 × 620.74
  4. Step 4: Simplify right side
    985.65x = 918,428.28
  5. Step 5: Solve for x
    x = 918,428.28/985.65
  6. Step 6: Final answer
    x = 931.80

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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.