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Finding the Fourth Proportional to 1,289.90, 1,934.87 and 316.01

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Solution

The fourth proportional to 1,289.90, 1,934.87 and 316.01 is: 474.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.90 : 1,934.87 = 316.01 : x
  2. Step 2: Convert to fraction form
    1,289.90/1,934.87 = 316.01/x
  3. Step 3: Cross multiply
    1,289.90x = 1,934.87 × 316.01
  4. Step 4: Simplify right side
    1,289.90x = 611,441.53
  5. Step 5: Solve for x
    x = 611,441.53/1,289.90
  6. Step 6: Final answer
    x = 474.02

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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.