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Finding the Fourth Proportional to 985.71, 1,479.78 and 903.09

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Solution

The fourth proportional to 985.71, 1,479.78 and 903.09 is: 1,355.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.71 : 1,479.78 = 903.09 : x
  2. Step 2: Convert to fraction form
    985.71/1,479.78 = 903.09/x
  3. Step 3: Cross multiply
    985.71x = 1,479.78 × 903.09
  4. Step 4: Simplify right side
    985.71x = 1,336,374.52
  5. Step 5: Solve for x
    x = 1,336,374.52/985.71
  6. Step 6: Final answer
    x = 1,355.75

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1.5x scale

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.